[libcxx-commits] [libcxx] [String] Allow fancy pointer as pointer type of basic_string allocator (PR #71182)

via libcxx-commits libcxx-commits at lists.llvm.org
Fri Nov 24 03:17:28 PST 2023


https://github.com/bemerybmw updated https://github.com/llvm/llvm-project/pull/71182

>From 790cb236365c0bf335bd70d699d74d518cdd8f4b Mon Sep 17 00:00:00 2001
From: Brendan Emery <brendan.be.emery at bmw.de>
Date: Fri, 3 Nov 2023 08:36:55 +0100
Subject: [PATCH] [String] Allow fancy pointer as pointer type of basic_string
 allocator

Currently, basic_string does not support custom allocators which use
fancy pointers that are not trivially constructible and destructible as
the pointer type. This is due to requirements of the internal string
representation, __rep. In order to use a pointer type which is not
trivially constructible, __rep should:

- be a literal type (required by the implementation). This requires that
__rep has at least one constexpr constructor and that its destructor is
trivial.
- provide an explicit constructor, copy constructor and copy assignment
operator (default special member functions are deleted since __long, a
variant member of __rep, is not trivially constructible as it contains a
fancy pointer as a member variable).

This change allows the use of fancy pointers which are not trivially
constructible by adding an explicit and constexpr constructor, copy
constructor and copy assignment operator. It also adds a static assert
which will fail if the fancy pointer is not trivially destructible.

Addresses bug report: https://bugs.llvm.org/show_bug.cgi?id=20508
---
 libcxx/include/string                         | 157 +++++++++++++-
 .../basic.string/alignof.compile.pass.cpp     |  15 ++
 .../basic.string/sizeof.compile.pass.cpp      |  35 ++++
 .../string.access/assert.back.pass.cpp        |   2 +
 .../string.access/assert.cback.pass.cpp       |   2 +
 .../string.access/assert.cfront.pass.cpp      |   2 +
 .../string.access/assert.cindex.pass.cpp      |   2 +
 .../string.access/assert.front.pass.cpp       |   2 +
 .../string.access/assert.index.pass.cpp       |   2 +
 .../string.capacity/PR53170.pass.cpp          |   2 +
 .../string.cons/copy_shrunk_long.pass.cpp     |   9 +-
 .../debug.iterator.add.pass.cpp               |   2 +
 .../debug.iterator.compare.pass.cpp           |   2 +
 .../debug.iterator.decrement.pass.cpp         |   2 +
 .../debug.iterator.dereference.pass.cpp       |   2 +
 .../debug.iterator.increment.pass.cpp         |   2 +
 .../debug.iterator.index.pass.cpp             |   2 +
 .../debug.iterator.subtract.pass.cpp          |   2 +
 .../assert.erase_iter.null.pass.cpp           |   2 +
 .../string.modifiers/assert.pop_back.pass.cpp |   2 +
 .../debug.erase.iter.pass.cpp                 |   2 +
 .../debug.erase.iter_iter.pass.cpp            |   2 +
 .../debug.insert.iter_char.pass.cpp           |   2 +
 .../debug.insert.iter_iter_iter.pass.cpp      |   2 +
 .../debug.insert.iter_size_char.pass.cpp      |   2 +
 .../resize_default_initialized.pass.cpp       |   6 +
 .../basic.string.hash/enabled_hashes.pass.cpp |   1 +
 .../basic.string/string.access/at.pass.cpp    |   2 +
 .../basic.string/string.access/back.pass.cpp  |   2 +
 .../basic.string/string.access/front.pass.cpp |   2 +
 .../basic.string/string.access/index.pass.cpp |   3 +
 .../string.capacity/clear.pass.cpp            |   2 +
 .../string.capacity/empty.pass.cpp            |   2 +
 .../string.capacity/length.pass.cpp           |   2 +
 .../string.capacity/max_size.pass.cpp         |   2 +
 .../string.capacity/over_max_size.pass.cpp    |   2 +
 .../string.capacity/reserve.pass.cpp          |   2 +
 .../string.capacity/reserve_size.pass.cpp     |   2 +
 .../resize_and_overwrite.pass.cpp             |  18 ++
 .../string.capacity/resize_size.pass.cpp      |   2 +
 .../string.capacity/resize_size_char.pass.cpp |   2 +
 .../string.capacity/shrink_to_fit.pass.cpp    |   2 +
 .../string.capacity/size.pass.cpp             |   2 +
 .../string.cons/T_size_size.pass.cpp          |   1 +
 .../basic.string/string.cons/alloc.pass.cpp   |   2 +
 .../string.cons/char_assignment.pass.cpp      |   2 +
 .../basic.string/string.cons/copy.pass.cpp    |   1 +
 .../string.cons/copy_alloc.pass.cpp           |   1 +
 .../string.cons/copy_assignment.pass.cpp      |   2 +
 .../basic.string/string.cons/default.pass.cpp |   3 +
 .../basic.string/string.cons/dtor.pass.cpp    |   3 +
 .../string.cons/initializer_list.pass.cpp     |   1 +
 .../initializer_list_assignment.pass.cpp      |   2 +
 .../string.cons/iter_alloc.pass.cpp           |   1 +
 .../string.cons/iter_alloc_deduction.pass.cpp |  20 ++
 .../basic.string/string.cons/move.pass.cpp    |   1 +
 .../string.cons/move_alloc.pass.cpp           |  12 ++
 .../string.cons/move_assign_noexcept.pass.cpp |   4 +
 .../string.cons/move_assignment.pass.cpp      |   1 +
 .../string.cons/move_noexcept.pass.cpp        |   4 +
 .../string.cons/pointer_alloc.pass.cpp        |   1 +
 .../string.cons/pointer_assignment.pass.cpp   |   2 +
 .../string.cons/pointer_size_alloc.pass.cpp   |   1 +
 .../string.cons/size_char_alloc.pass.cpp      |   1 +
 .../string.cons/string_view.pass.cpp          |   1 +
 .../string_view_assignment.pass.cpp           |   2 +
 .../string_view_deduction.pass.cpp            |  40 ++++
 .../string_view_size_size_deduction.pass.cpp  |  40 ++++
 .../basic.string/string.cons/substr.pass.cpp  |   1 +
 .../string.cons/substr_rvalue.pass.cpp        |   1 +
 .../string.contains/contains.char.pass.cpp    |   2 +
 .../string.contains/contains.ptr.pass.cpp     |   2 +
 .../contains.string_view.pass.cpp             |   2 +
 .../string.ends_with/ends_with.char.pass.cpp  |   2 +
 .../string.ends_with/ends_with.ptr.pass.cpp   |   2 +
 .../ends_with.string_view.pass.cpp            |   2 +
 .../string.iterators/begin.pass.cpp           |   2 +
 .../string.iterators/cbegin.pass.cpp          |   2 +
 .../string.iterators/cend.pass.cpp            |   2 +
 .../string.iterators/crbegin.pass.cpp         |   2 +
 .../string.iterators/crend.pass.cpp           |   2 +
 .../string.iterators/end.pass.cpp             |   2 +
 .../string.iterators/rbegin.pass.cpp          |   2 +
 .../string.iterators/rend.pass.cpp            |   2 +
 .../robust_against_adl.pass.cpp               |   4 +
 .../string_append/T_size_size.pass.cpp        |   2 +
 .../string_append/initializer_list.pass.cpp   |   2 +
 .../string_append/iterator.pass.cpp           |   4 +-
 .../string_append/pointer.pass.cpp            |   2 +
 .../string_append/pointer_size.pass.cpp       |   2 +
 .../string_append/push_back.pass.cpp          |   2 +
 .../string_append/size_char.pass.cpp          |   2 +
 .../string_append/string.pass.cpp             |   2 +
 .../string_append/string_size_size.pass.cpp   |   2 +
 .../string_append/string_view.pass.cpp        |   2 +
 .../string_assign/T_size_size.pass.cpp        |   2 +
 .../string_assign/initializer_list.pass.cpp   |   4 +-
 .../string_assign/iterator.pass.cpp           |   4 +-
 .../string_assign/pointer.pass.cpp            |   2 +
 .../string_assign/pointer_size.pass.cpp       |   2 +
 .../string_assign/rv_string.pass.cpp          |   2 +
 .../string_assign/size_char.pass.cpp          |   2 +
 .../string_assign/string.pass.cpp             |   8 +
 .../string_assign/string_size_size.pass.cpp   |   2 +
 .../string_assign/string_view.pass.cpp        |   1 +
 .../string_copy/copy.pass.cpp                 |   2 +
 .../string_erase/iter.pass.cpp                |   2 +
 .../string_erase/iter_iter.pass.cpp           |   2 +
 .../string_erase/pop_back.pass.cpp            |   2 +
 .../string_erase/size_size.pass.cpp           |   2 +
 .../string_insert/iter_char.pass.cpp          |   2 +
 .../iter_initializer_list.pass.cpp            |   2 +
 .../string_insert/iter_iter_iter.pass.cpp     |   2 +
 .../string_insert/iter_size_char.pass.cpp     |   2 +
 .../string_insert/size_T_size_size.pass.cpp   |   3 +
 .../string_insert/size_pointer.pass.cpp       |   2 +
 .../string_insert/size_pointer_size.pass.cpp  |   3 +
 .../string_insert/size_size_char.pass.cpp     |   2 +
 .../string_insert/size_string.pass.cpp        |   2 +
 .../size_string_size_size.pass.cpp            |   2 +
 .../string_insert/string_view.pass.cpp        |   2 +
 .../string_op_plus_equal/char.pass.cpp        |   2 +
 .../initializer_list.pass.cpp                 |   2 +
 .../string_op_plus_equal/pointer.pass.cpp     |   2 +
 .../string_op_plus_equal/string.pass.cpp      |   2 +
 .../iter_iter_initializer_list.pass.cpp       |   2 +
 .../iter_iter_iter_iter.pass.cpp              |   2 +
 .../string_replace/iter_iter_pointer.pass.cpp |   2 +
 .../iter_iter_pointer_size.pass.cpp           |   2 +
 .../iter_iter_size_char.pass.cpp              |   4 +-
 .../string_replace/iter_iter_string.pass.cpp  |   2 +
 .../iter_iter_string_view.pass.cpp            |   2 +
 .../size_size_T_size_size.pass.cpp            |   2 +
 .../string_replace/size_size_pointer.pass.cpp |   2 +
 .../size_size_pointer_size.pass.cpp           |   2 +
 .../size_size_size_char.pass.cpp              |   2 +
 .../string_replace/size_size_string.pass.cpp  |   2 +
 .../size_size_string_size_size.pass.cpp       |   2 +
 .../size_size_string_view.pass.cpp            |   2 +
 .../string_swap/swap.pass.cpp                 |   2 +
 .../string.io/get_line.pass.cpp               |   2 +
 .../string.io/get_line_delim.pass.cpp         |   2 +
 .../string.io/get_line_delim_rv.pass.cpp      |   2 +
 .../string.io/get_line_rv.pass.cpp            |   4 +
 .../string.io/stream_extract.pass.cpp         |   2 +
 .../string.io/stream_insert.pass.cpp          |   2 +
 .../string.special/swap.pass.cpp              |   2 +
 .../string_op!=/pointer_string.pass.cpp       |   2 +
 .../string_op!=/string_pointer.pass.cpp       |   2 +
 .../string_op!=/string_string.pass.cpp        |   2 +
 .../string_op!=/string_string_view.pass.cpp   |   2 +
 .../string_op!=/string_view_string.pass.cpp   |   2 +
 .../string_op+/char_string.pass.cpp           |   2 +
 .../string_op+/pointer_string.pass.cpp        |   2 +
 .../string_op+/string_char.pass.cpp           |   2 +
 .../string_op+/string_pointer.pass.cpp        |   2 +
 .../string_op+/string_string.pass.cpp         |   2 +
 .../string_operator==/pointer_string.pass.cpp |   2 +
 .../string_operator==/string_pointer.pass.cpp |   2 +
 .../string_operator==/string_string.pass.cpp  |   2 +
 .../string_string_view.pass.cpp               |   2 +
 .../string_view_string.pass.cpp               |   2 +
 .../string_opgt/pointer_string.pass.cpp       |   2 +
 .../string_opgt/string_pointer.pass.cpp       |   2 +
 .../string_opgt/string_string.pass.cpp        |   2 +
 .../string_opgt/string_string_view.pass.cpp   |   2 +
 .../string_opgt/string_view_string.pass.cpp   |   2 +
 .../string_opgt=/pointer_string.pass.cpp      |   2 +
 .../string_opgt=/string_pointer.pass.cpp      |   2 +
 .../string_opgt=/string_string.pass.cpp       |   2 +
 .../string_opgt=/string_string_view.pass.cpp  |   2 +
 .../string_opgt=/string_view_string.pass.cpp  |   2 +
 .../string_oplt/pointer_string.pass.cpp       |   2 +
 .../string_oplt/string_pointer.pass.cpp       |   2 +
 .../string_oplt/string_string.pass.cpp        |   2 +
 .../string_oplt/string_string_view.pass.cpp   |   2 +
 .../string_oplt/string_view_string.pass.cpp   |   2 +
 .../string_oplt=/pointer_string.pass.cpp      |   2 +
 .../string_oplt=/string_pointer.pass.cpp      |   2 +
 .../string_oplt=/string_string.pass.cpp       |   2 +
 .../string_oplt=/string_string_view.pass.cpp  |   2 +
 .../string_oplt=/string_view_string.pass.cpp  |   2 +
 .../string.accessors/c_str.pass.cpp           |   2 +
 .../string.ops/string.accessors/data.pass.cpp |   2 +
 .../string.accessors/get_allocator.pass.cpp   |   1 +
 .../string_compare/pointer.pass.cpp           |   2 +
 .../size_size_T_size_size.pass.cpp            |   2 +
 .../string_compare/size_size_pointer.pass.cpp |   2 +
 .../size_size_pointer_size.pass.cpp           |   2 +
 .../string_compare/size_size_string.pass.cpp  |   2 +
 .../size_size_string_size_size.pass.cpp       |   2 +
 .../size_size_string_view.pass.cpp            |   2 +
 .../string.ops/string_compare/string.pass.cpp |   2 +
 .../string_compare/string_view.pass.cpp       |   2 +
 .../char_size.pass.cpp                        |   2 +
 .../pointer_size.pass.cpp                     |   2 +
 .../pointer_size_size.pass.cpp                |   2 +
 .../string_size.pass.cpp                      |   2 +
 .../string_view_size.pass.cpp                 |   2 +
 .../string_find.first.of/char_size.pass.cpp   |   2 +
 .../pointer_size.pass.cpp                     |   2 +
 .../pointer_size_size.pass.cpp                |   2 +
 .../string_find.first.of/string_size.pass.cpp |   2 +
 .../string_view_size.pass.cpp                 |   2 +
 .../char_size.pass.cpp                        |   2 +
 .../pointer_size.pass.cpp                     |   2 +
 .../pointer_size_size.pass.cpp                |   2 +
 .../string_size.pass.cpp                      |   2 +
 .../string_view_size.pass.cpp                 |   2 +
 .../string_find.last.of/char_size.pass.cpp    |   2 +
 .../string_find.last.of/pointer_size.pass.cpp |   2 +
 .../pointer_size_size.pass.cpp                |   2 +
 .../string_find.last.of/string_size.pass.cpp  |   2 +
 .../string_view_size.pass.cpp                 |   2 +
 .../string.ops/string_find/char_size.pass.cpp |   2 +
 .../string_find/pointer_size.pass.cpp         |   2 +
 .../string_find/pointer_size_size.pass.cpp    |   2 +
 .../string_find/string_size.pass.cpp          |   2 +
 .../string_find/string_view_size.pass.cpp     |   2 +
 .../string_rfind/char_size.pass.cpp           |   2 +
 .../string_rfind/pointer_size.pass.cpp        |   2 +
 .../string_rfind/pointer_size_size.pass.cpp   |   2 +
 .../string_rfind/string_size.pass.cpp         |   2 +
 .../string_rfind/string_view_size.pass.cpp    |   2 +
 .../string.ops/string_substr/substr.pass.cpp  |   1 +
 .../string_substr/substr_rvalue.pass.cpp      |   1 +
 .../string.require/contiguous.pass.cpp        |   1 +
 .../starts_with.char.pass.cpp                 |   2 +
 .../starts_with.ptr.pass.cpp                  |   2 +
 .../starts_with.string_view.pass.cpp          |   2 +
 .../std/strings/basic.string/types.pass.cpp   |   2 +
 .../strings/strings.erasure/erase.pass.cpp    |   5 +-
 .../strings/strings.erasure/erase_if.pass.cpp |   5 +-
 libcxx/test/support/test_allocator.h          | 194 +++++++++++++++++-
 234 files changed, 989 insertions(+), 17 deletions(-)

diff --git a/libcxx/include/string b/libcxx/include/string
index 68f13414c7b6948..759ca7e41b44c3b 100644
--- a/libcxx/include/string
+++ b/libcxx/include/string
@@ -816,7 +816,10 @@ private:
 
     static_assert(sizeof(__short) == (sizeof(value_type) * (__min_cap + 1)), "__short has an unexpected size.");
 
-    union __ulx{__long __lx; __short __lxx;};
+    union __ulx {
+      __long __lx;
+      __short __lxx;
+    };
 
     enum {__n_words = sizeof(__ulx) / sizeof(size_type)};
 
@@ -825,6 +828,7 @@ private:
         size_type __words[__n_words];
     };
 
+#ifdef _LIBCPP_CXX03_LANG
     struct __rep
     {
         union
@@ -834,6 +838,124 @@ private:
             __raw   __r;
         };
     };
+#else
+    // Since C++03, unions can contain members with non-trivial special member functions (C++03 doesn't allow unions to
+    // contain members with non-trivial special member functions). In this case, the corresponding special member
+    // function in the union will be deleted and therefore must be explicitly defined. Therefore, to support fancy
+    // pointers with non-trivial special member functions in __long, we must explicitly define a constructor, copy
+    // constructor and copy assignment operator in __rep.
+
+    struct __rep {
+        _LIBCPP_CONSTEXPR_SINCE_CXX20 __rep() _NOEXCEPT : __s{} {
+            // We don't necessarily need to explicitly initialise __s here. __s can be implicitly created with simple 
+            // assignment. __l just needs to be first have its lifetime created with std::construct_at().
+
+            // Begin the lifetime of __l
+            // https://stackoverflow.com/questions/70549096/does-stdconstruct-at-make-an-array-member-of-a-union-active
+            // It seems that once the lifetime has begun, we can perform simple assignments during constant evaluation
+            // More cryptic info here: https://timsong-cpp.github.io/cppwp/n4868/class.union.general#6 (linked from previous
+            // SO post).
+            // std::construct_at(&__l);
+            // std::construct_at(&__s);
+        }
+        
+        _LIBCPP_CONSTEXPR_SINCE_CXX20 ~__rep() _NOEXCEPT {
+            // Add explicit destruction of __long every time we change from long to short.
+            if (__is_rep_long(*this)) {
+                __l.~__long();
+            }
+        }
+
+        _LIBCPP_CONSTEXPR_SINCE_CXX20 bool __is_rep_long(const __rep& __str_rep) const _NOEXCEPT {
+            if (__libcpp_is_constant_evaluated() && __builtin_constant_p(__str_rep.__l.__is_long_)) {
+                return __str_rep.__l.__is_long_;
+            }
+            return __str_rep.__s.__is_long_;
+        }
+
+        _LIBCPP_CONSTEXPR_SINCE_CXX20 __rep(const __rep& __other) _NOEXCEPT : __s{} {
+            // For certain fancy pointers such as offset pointers, the value of __l.__data_ will be different for 2 pointers
+            // pointing to the same object (because the offset is calculated with respect to the pointer itself). Therefore,
+            // the copy assignment operator of the underlying pointer needs to be explicitly called. For a short string, the
+            // memory should be directly copied.
+            if (__is_rep_long(__other)) {
+                // If the current string is currently short, we need to first activate the long member
+                    // before assigning to it.
+                    #if _LIBCPP_STD_VER >= 20
+                        if (__libcpp_is_constant_evaluated() && !__is_rep_long(*this)) {
+                            std::construct_at(std::addressof(__l));
+                        }
+                    #endif // _LIBCPP_STD_VER >= 20
+
+                __l.__is_long_ = __other.__l.__is_long_;
+                __l.__cap_ = __other.__l.__cap_;
+                __l.__size_ = __other.__l.__size_;
+                __l.__data_ = __other.__l.__data_;
+            } else {
+                // If the current string is currently long, we need to first activate the short member
+                // before assigning to it.
+                #if _LIBCPP_STD_VER >= 20
+                        if (__libcpp_is_constant_evaluated() && __is_rep_long(*this)) {
+                            __s = __short();
+                        }
+                    #endif // _LIBCPP_STD_VER >= 20
+                __s.__is_long_ = __other.__s.__is_long_;
+                __s.__size_ = __other.__s.__size_;
+
+                for (size_type __i = 0; __i < sizeof(value_type) - 1; ++__i) {
+                    __s.__padding_[__i] = __other.__s.__padding_[__i];
+                }
+
+                for (size_type __i = 0;  __i <__min_cap; ++__i) {
+                    __s.__data_[__i] = __other.__s.__data_[__i];
+                }
+            }
+        }
+
+        _LIBCPP_CONSTEXPR_SINCE_CXX20 __rep& operator=(const __rep& __other) _NOEXCEPT {
+            if (this != &__other) {
+                if (__is_rep_long(__other)) {
+                    // If the current string is currently short, we need to first active the long member
+                    // before assigning to it.
+                    #if _LIBCPP_STD_VER >= 20
+                        if (__libcpp_is_constant_evaluated() && !__is_rep_long(*this)) {
+                            std::construct_at(std::addressof(__l));
+                        }
+                    #endif // _LIBCPP_STD_VER >= 20
+                    
+                    __l.__is_long_ = __other.__l.__is_long_;
+                    __l.__cap_ = __other.__l.__cap_;
+                    __l.__size_ = __other.__l.__size_;
+                    __l.__data_ = __other.__l.__data_;
+                    // __other.__l.~__long();
+                } else {
+                    #if _LIBCPP_STD_VER >= 20
+                        if (__libcpp_is_constant_evaluated() && __is_rep_long(*this)) {
+                            __s = __short();
+                        }
+                    #endif // _LIBCPP_STD_VER >= 20
+                    __s.__is_long_ = __other.__s.__is_long_;
+                    __s.__size_ = __other.__s.__size_;
+
+                    for (size_type __i = 0; __i <sizeof(value_type) - 1; ++__i) {
+                        __s.__padding_[__i] = __other.__s.__padding_[__i];
+                    }
+
+                    for (size_type __i = 0;  __i <__min_cap; ++__i) {
+                        __s.__data_[__i] = __other.__s.__data_[__i];
+                    }
+                }
+            }
+            return *this;
+        }
+
+        union {
+            __short __s;
+            __long __l;
+            __raw __r;
+        };
+    };
+#endif // _LIBCPP_CXX03_LANG
 
     __compressed_pair<__rep, allocator_type> __r_;
 
@@ -852,6 +974,7 @@ private:
             auto __capacity = __recommend(__size) + 1;
             auto __allocation = __alloc_traits::allocate(__alloc(), __capacity);
             __begin_lifetime(__allocation, __capacity);
+            __begin_long_lifetime();
             __set_long_cap(__capacity);
             __set_long_pointer(__allocation);
             __set_long_size(__size);
@@ -1757,6 +1880,29 @@ private:
 #endif // _LIBCPP_STD_VER >= 20
     }
 
+    // If __long is not trivially constructible (this occurs if the pointer type inside __long is not trivially constructible)
+    // then the lifetime of __l must be explicitly started with std::construct_at before it can be assigned to. If __long is 
+    // trivially constructible, then the lifetime of __l can be implicitly started with a simple assignment.
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __begin_long_lifetime() {
+#if _LIBCPP_STD_VER >= 20
+        // if constexpr (is_trivially_constructible<__long>::value) {
+            std::construct_at(std::addressof(__r_.first().__l));
+        // }
+#endif // _LIBCPP_STD_VER >= 20
+    }
+
+    // If __long is not trivially destructible (this occurs if the pointer type inside __long is not trivially destructible)
+    // then the lifetime of __l must be explicitly ended before changing the active data member from __l. Otherwise, the 
+    // destructor will never be called. Therefore, __end_long_lifetime() must be called everytime we change from __l to 
+    // __s or __r.
+    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __end_long_lifetime() {
+#if _LIBCPP_STD_VER >= 20
+        // if constexpr (is_trivially_constructible<__long>::value) {
+            __r_.first().~__l();
+        // }
+#endif // _LIBCPP_STD_VER >= 20
+    }
+
     _LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI static bool __fits_in_sso(size_type __sz) {
         return __sz < __min_cap;
     }
@@ -1969,6 +2115,7 @@ private:
                     if (__is_long())
                         __alloc_traits::deallocate(__alloc(), __get_long_pointer(), __get_long_cap());
                     __alloc() = std::move(__a);
+                    __begin_long_lifetime(); 
                     __set_long_pointer(__allocation.ptr);
                     __set_long_cap(__allocation.count);
                     __set_long_size(__str.size());
@@ -2131,6 +2278,7 @@ void basic_string<_CharT, _Traits, _Allocator>::__init(const value_type* __s,
         auto __allocation = std::__allocate_at_least(__alloc(), __recommend(__reserve) + 1);
         __p = __allocation.ptr;
         __begin_lifetime(__p, __allocation.count);
+        __begin_long_lifetime(); 
         __set_long_pointer(__p);
         __set_long_cap(__allocation.count);
         __set_long_size(__sz);
@@ -2159,6 +2307,7 @@ basic_string<_CharT, _Traits, _Allocator>::__init(const value_type* __s, size_ty
         auto __allocation = std::__allocate_at_least(__alloc(), __recommend(__sz) + 1);
         __p = __allocation.ptr;
         __begin_lifetime(__p, __allocation.count);
+        __begin_long_lifetime(); 
         __set_long_pointer(__p);
         __set_long_cap(__allocation.count);
         __set_long_size(__sz);
@@ -2184,6 +2333,7 @@ void basic_string<_CharT, _Traits, _Allocator>::__init_copy_ctor_external(
     auto __allocation = std::__allocate_at_least(__alloc(), __recommend(__sz) + 1);
     __p = __allocation.ptr;
     __begin_lifetime(__p, __allocation.count);
+    __begin_long_lifetime(); 
     __set_long_pointer(__p);
     __set_long_cap(__allocation.count);
     __set_long_size(__sz);
@@ -2212,6 +2362,7 @@ basic_string<_CharT, _Traits, _Allocator>::__init(size_type __n, value_type __c)
         auto __allocation = std::__allocate_at_least(__alloc(), __recommend(__n) + 1);
         __p = __allocation.ptr;
         __begin_lifetime(__p, __allocation.count);
+        __begin_long_lifetime(); 
         __set_long_pointer(__p);
         __set_long_cap(__allocation.count);
         __set_long_size(__n);
@@ -2283,6 +2434,7 @@ void basic_string<_CharT, _Traits, _Allocator>::__init_with_size(
         auto __allocation = std::__allocate_at_least(__alloc(), __recommend(__sz) + 1);
         __p = __allocation.ptr;
         __begin_lifetime(__p, __allocation.count);
+        __begin_long_lifetime(); 
         __set_long_pointer(__p);
         __set_long_cap(__allocation.count);
         __set_long_size(__sz);
@@ -2334,6 +2486,7 @@ basic_string<_CharT, _Traits, _Allocator>::__grow_by_and_replace
                           std::__to_address(__old_p) + __n_copy + __n_del, __sec_cp_sz);
     if (__old_cap+1 != __min_cap)
         __alloc_traits::deallocate(__alloc(), __old_p, __old_cap+1);
+    __begin_long_lifetime();
     __set_long_pointer(__p);
     __set_long_cap(__allocation.count);
     __old_sz = __n_copy + __n_add + __sec_cp_sz;
@@ -2374,6 +2527,7 @@ basic_string<_CharT, _Traits, _Allocator>::__grow_by(size_type __old_cap, size_t
                           __sec_cp_sz);
     if (__old_cap + 1 != __min_cap)
         __alloc_traits::deallocate(__alloc(), __old_p, __old_cap + 1);
+    __begin_long_lifetime();
     __set_long_pointer(__p);
     __set_long_cap(__allocation.count);
 }
@@ -3304,6 +3458,7 @@ basic_string<_CharT, _Traits, _Allocator>::__shrink_or_extend(size_type __target
         __alloc_traits::deallocate(__alloc(), __p, __cap+1);
     if (__now_long)
     {
+        __begin_long_lifetime();
         __set_long_cap(__target_capacity+1);
         __set_long_size(__sz);
         __set_long_pointer(__new_data);
diff --git a/libcxx/test/libcxx/strings/basic.string/alignof.compile.pass.cpp b/libcxx/test/libcxx/strings/basic.string/alignof.compile.pass.cpp
index 7b4d54ed410b027..fb6b6e917cb99c1 100644
--- a/libcxx/test/libcxx/strings/basic.string/alignof.compile.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/alignof.compile.pass.cpp
@@ -44,6 +44,9 @@ class small_iter_allocator {
 template <class CharT>
 using min_string = std::basic_string<CharT, std::char_traits<CharT>, min_allocator<CharT>>;
 
+template <class CharT>
+using fancy_string = std::basic_string<CharT, std::char_traits<CharT>, fancy_pointer_allocator<CharT>>;
+
 template <class CharT>
 using test_string = std::basic_string<CharT, std::char_traits<CharT>, test_allocator<CharT>>;
 
@@ -54,6 +57,7 @@ using small_string = std::basic_string<CharT, std::char_traits<CharT>, small_ite
 
 static_assert(alignof(std::string) == 8, "");
 static_assert(alignof(min_string<char>) == 8, "");
+static_assert(alignof(fancy_string<char>) == 8, "");
 static_assert(alignof(test_string<char>) == 8, "");
 static_assert(alignof(small_string<char>) == 2, "");
 
@@ -61,11 +65,13 @@ static_assert(alignof(small_string<char>) == 2, "");
 #    if __WCHAR_WIDTH__ == 32
 static_assert(alignof(std::wstring) == 8, "");
 static_assert(alignof(min_string<wchar_t>) == 8, "");
+static_assert(alignof(fancy_string<wchar_t>) == 8, "");
 static_assert(alignof(test_string<wchar_t>) == 8, "");
 static_assert(alignof(small_string<wchar_t>) == 4, "");
 #    elif __WCHAR_WIDTH__ == 16
 static_assert(alignof(std::wstring) == 8, "");
 static_assert(alignof(min_string<wchar_t>) == 8, "");
+static_assert(alignof(fancy_string<wchar_t>) == 8, "");
 static_assert(alignof(test_string<wchar_t>) == 8, "");
 static_assert(alignof(small_string<wchar_t>) == 2, "");
 #    else
@@ -76,6 +82,7 @@ static_assert(alignof(small_string<wchar_t>) == 2, "");
 #  ifndef TEST_HAS_NO_CHAR8_T
 static_assert(alignof(std::u8string) == 8, "");
 static_assert(alignof(min_string<char8_t>) == 8, "");
+static_assert(alignof(fancy_string<char8_t>) == 8, "");
 static_assert(alignof(test_string<char8_t>) == 8, "");
 static_assert(alignof(small_string<char8_t>) == 2, "");
 #  endif
@@ -85,6 +92,8 @@ static_assert(alignof(std::u16string) == 8, "");
 static_assert(alignof(std::u32string) == 8, "");
 static_assert(alignof(min_string<char16_t>) == 8, "");
 static_assert(alignof(min_string<char32_t>) == 8, "");
+static_assert(alignof(fancy_string<char16_t>) == 8, "");
+static_assert(alignof(fancy_string<char32_t>) == 8, "");
 static_assert(alignof(test_string<char16_t>) == 8, "");
 static_assert(alignof(test_string<char32_t>) == 8, "");
 static_assert(alignof(small_string<char16_t>) == 2, "");
@@ -95,6 +104,7 @@ static_assert(alignof(small_string<char32_t>) == 4, "");
 
 static_assert(alignof(std::string) == 4, "");
 static_assert(alignof(min_string<char>) == 4, "");
+static_assert(alignof(fancy_string<char>) == 4, "");
 static_assert(alignof(test_string<char>) == 4, "");
 static_assert(alignof(small_string<char>) == 2, "");
 
@@ -102,11 +112,13 @@ static_assert(alignof(small_string<char>) == 2, "");
 #    if __WCHAR_WIDTH__ == 32
 static_assert(alignof(std::wstring) == 4, "");
 static_assert(alignof(min_string<wchar_t>) == 4, "");
+static_assert(alignof(fancy_string<wchar_t>) == 4, "");
 static_assert(alignof(test_string<wchar_t>) == 4, "");
 static_assert(alignof(small_string<wchar_t>) == 4, "");
 #    elif __WCHAR_WIDTH__ == 16
 static_assert(alignof(std::wstring) == 4, "");
 static_assert(alignof(min_string<wchar_t>) == 4, "");
+static_assert(alignof(fancy_string<wchar_t>) == 4, "");
 static_assert(alignof(test_string<wchar_t>) == 4, "");
 static_assert(alignof(small_string<wchar_t>) == 2, "");
 #    else
@@ -117,6 +129,7 @@ static_assert(alignof(small_string<wchar_t>) == 2, "");
 #  ifndef TEST_HAS_NO_CHAR8_T
 static_assert(alignof(std::u8string) == 4, "");
 static_assert(alignof(min_string<char8_t>) == 4, "");
+static_assert(alignof(fancy_string<char8_t>) == 4, "");
 static_assert(alignof(test_string<char8_t>) == 4, "");
 static_assert(alignof(small_string<char8_t>) == 2, "");
 #  endif
@@ -126,6 +139,8 @@ static_assert(alignof(std::u16string) == 4, "");
 static_assert(alignof(std::u32string) == 4, "");
 static_assert(alignof(min_string<char16_t>) == 4, "");
 static_assert(alignof(min_string<char32_t>) == 4, "");
+static_assert(alignof(fancy_string<char16_t>) == 4, "");
+static_assert(alignof(fancy_string<char32_t>) == 4, "");
 static_assert(alignof(test_string<char16_t>) == 4, "");
 static_assert(alignof(test_string<char32_t>) == 4, "");
 static_assert(alignof(small_string<char32_t>) == 4, "");
diff --git a/libcxx/test/libcxx/strings/basic.string/sizeof.compile.pass.cpp b/libcxx/test/libcxx/strings/basic.string/sizeof.compile.pass.cpp
index 6e00e43618b2e36..2788c1274b4b0dc 100644
--- a/libcxx/test/libcxx/strings/basic.string/sizeof.compile.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/sizeof.compile.pass.cpp
@@ -42,6 +42,9 @@ class small_iter_allocator {
 template <class CharT>
 using min_string = std::basic_string<CharT, std::char_traits<CharT>, min_allocator<CharT> >;
 
+template <class CharT>
+using fancy_string = std::basic_string<CharT, std::char_traits<CharT>, fancy_pointer_allocator<CharT> >;
+
 template <class CharT>
 using test_string = std::basic_string<CharT, std::char_traits<CharT>, test_allocator<CharT> >;
 
@@ -52,6 +55,9 @@ using small_string = std::basic_string<CharT, std::char_traits<CharT>, small_ite
 
 static_assert(sizeof(std::string) == 24, "");
 static_assert(sizeof(min_string<char>) == 24, "");
+#  if TEST_STD_VER >= 11
+static_assert(sizeof(fancy_string<char>) == 24, "");
+#  endif
 static_assert(sizeof(test_string<char>) == 32, "");
 static_assert(sizeof(small_string<char>) == 6, "");
 
@@ -59,11 +65,17 @@ static_assert(sizeof(small_string<char>) == 6, "");
 #    if __WCHAR_WIDTH__ == 32
 static_assert(sizeof(std::wstring) == 24, "");
 static_assert(sizeof(min_string<wchar_t>) == 24, "");
+#      if TEST_STD_VER >= 11
+static_assert(sizeof(fancy_string<wchar_t>) == 24, "");
+#      endif
 static_assert(sizeof(test_string<wchar_t>) == 32, "");
 static_assert(sizeof(small_string<wchar_t>) == 12, "");
 #    elif __WCHAR_WIDTH__ == 16
 static_assert(sizeof(std::wstring) == 24, "");
 static_assert(sizeof(min_string<wchar_t>) == 24, "");
+#      if TEST_STD_VER >= 11
+static_assert(sizeof(fancy_string<wchar_t>) == 24, "");
+#      endif
 static_assert(sizeof(test_string<wchar_t>) == 32, "");
 static_assert(sizeof(small_string<wchar_t>) == 6, "");
 #    else
@@ -74,6 +86,9 @@ static_assert(sizeof(small_string<wchar_t>) == 6, "");
 #  ifndef TEST_HAS_NO_CHAR8_T
 static_assert(sizeof(std::u8string) == 24, "");
 static_assert(sizeof(min_string<char8_t>) == 24, "");
+#    if TEST_STD_VER >= 11
+static_assert(sizeof(fancy_string<char8_t>) == 24, "");
+#    endif
 static_assert(sizeof(test_string<char8_t>) == 32, "");
 static_assert(sizeof(small_string<char8_t>) == 6, "");
 #  endif
@@ -83,6 +98,10 @@ static_assert(sizeof(std::u16string) == 24, "");
 static_assert(sizeof(std::u32string) == 24, "");
 static_assert(sizeof(min_string<char16_t>) == 24, "");
 static_assert(sizeof(min_string<char32_t>) == 24, "");
+#    if TEST_STD_VER >= 11
+static_assert(sizeof(fancy_string<char16_t>) == 24, "");
+static_assert(sizeof(fancy_string<char32_t>) == 24, "");
+#    endif
 static_assert(sizeof(test_string<char16_t>) == 32, "");
 static_assert(sizeof(test_string<char32_t>) == 32, "");
 static_assert(sizeof(small_string<char16_t>) == 6, "");
@@ -93,6 +112,9 @@ static_assert(sizeof(small_string<char32_t>) == 12, "");
 
 static_assert(sizeof(std::string) == 12, "");
 static_assert(sizeof(min_string<char>) == 12, "");
+#  if TEST_STD_VER >= 11
+static_assert(sizeof(fancy_string<char>) == 12, "");
+#  endif
 static_assert(sizeof(test_string<char>) == 24, "");
 static_assert(sizeof(small_string<char>) == 6, "");
 
@@ -100,11 +122,17 @@ static_assert(sizeof(small_string<char>) == 6, "");
 #    if __WCHAR_WIDTH__ == 32
 static_assert(sizeof(std::wstring) == 12, "");
 static_assert(sizeof(min_string<wchar_t>) == 12, "");
+#      if TEST_STD_VER >= 11
+static_assert(sizeof(fancy_string<wchar_t>) == 12, "");
+#      endif
 static_assert(sizeof(test_string<wchar_t>) == 24, "");
 static_assert(sizeof(small_string<wchar_t>) == 12, "");
 #    elif __WCHAR_WIDTH__ == 16
 static_assert(sizeof(std::wstring) == 12, "");
 static_assert(sizeof(min_string<wchar_t>) == 12, "");
+#      if TEST_STD_VER >= 11
+static_assert(sizeof(fancy_string<wchar_t>) == 12, "");
+#      endif
 static_assert(sizeof(test_string<wchar_t>) == 24, "");
 static_assert(sizeof(small_string<wchar_t>) == 6, "");
 #    else
@@ -115,6 +143,9 @@ static_assert(sizeof(small_string<wchar_t>) == 6, "");
 #  ifndef TEST_HAS_NO_CHAR8_T
 static_assert(sizeof(std::u8string) == 12, "");
 static_assert(sizeof(min_string<char8_t>) == 12, "");
+#    if TEST_STD_VER >= 11
+static_assert(sizeof(fancy_string<char8_t>) == 12, "");
+#    endif
 static_assert(sizeof(test_string<char8_t>) == 24, "");
 static_assert(sizeof(small_string<char>) == 6, "");
 #  endif
@@ -124,6 +155,10 @@ static_assert(sizeof(std::u16string) == 12, "");
 static_assert(sizeof(std::u32string) == 12, "");
 static_assert(sizeof(min_string<char16_t>) == 12, "");
 static_assert(sizeof(min_string<char32_t>) == 12, "");
+#    if TEST_STD_VER >= 11
+static_assert(sizeof(fancy_string<char16_t>) == 12, "");
+static_assert(sizeof(fancy_string<char32_t>) == 12, "");
+#    endif
 static_assert(sizeof(test_string<char16_t>) == 24, "");
 static_assert(sizeof(test_string<char32_t>) == 24, "");
 static_assert(sizeof(small_string<char16_t>) == 6, "");
diff --git a/libcxx/test/libcxx/strings/basic.string/string.access/assert.back.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.access/assert.back.pass.cpp
index 9c6d49af7883e72..f288c0078b421a9 100644
--- a/libcxx/test/libcxx/strings/basic.string/string.access/assert.back.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.access/assert.back.pass.cpp
@@ -19,6 +19,7 @@
 
 #include "check_assertion.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 void test() {
@@ -29,6 +30,7 @@ void test() {
 int main(int, char**) {
   test<std::string>();
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 
   return 0;
 }
diff --git a/libcxx/test/libcxx/strings/basic.string/string.access/assert.cback.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.access/assert.cback.pass.cpp
index 7a89d06d2474135..1812f69987e859d 100644
--- a/libcxx/test/libcxx/strings/basic.string/string.access/assert.cback.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.access/assert.cback.pass.cpp
@@ -19,6 +19,7 @@
 
 #include "check_assertion.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 void test() {
@@ -29,6 +30,7 @@ void test() {
 int main(int, char**) {
   test<std::string>();
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 
   return 0;
 }
diff --git a/libcxx/test/libcxx/strings/basic.string/string.access/assert.cfront.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.access/assert.cfront.pass.cpp
index 30dc29a951c7bf6..3821854dcbbb76b 100644
--- a/libcxx/test/libcxx/strings/basic.string/string.access/assert.cfront.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.access/assert.cfront.pass.cpp
@@ -19,6 +19,7 @@
 
 #include "check_assertion.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 void test() {
@@ -29,6 +30,7 @@ void test() {
 int main(int, char**) {
   test<std::string>();
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 
   return 0;
 }
diff --git a/libcxx/test/libcxx/strings/basic.string/string.access/assert.cindex.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.access/assert.cindex.pass.cpp
index 2b4072826fd604d..dc0e2727688b03b 100644
--- a/libcxx/test/libcxx/strings/basic.string/string.access/assert.cindex.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.access/assert.cindex.pass.cpp
@@ -20,6 +20,7 @@
 
 #include "check_assertion.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 void test() {
@@ -31,6 +32,7 @@ void test() {
 int main(int, char**) {
   test<std::string>();
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 
   return 0;
 }
diff --git a/libcxx/test/libcxx/strings/basic.string/string.access/assert.front.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.access/assert.front.pass.cpp
index e75908ee07c1366..4492b0245fb223f 100644
--- a/libcxx/test/libcxx/strings/basic.string/string.access/assert.front.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.access/assert.front.pass.cpp
@@ -20,6 +20,7 @@
 
 #include "check_assertion.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 void test() {
@@ -30,6 +31,7 @@ void test() {
 int main(int, char**) {
   test<std::string>();
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 
   return 0;
 }
diff --git a/libcxx/test/libcxx/strings/basic.string/string.access/assert.index.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.access/assert.index.pass.cpp
index 95701314faf8e2d..f0cc44c2ec4cd11 100644
--- a/libcxx/test/libcxx/strings/basic.string/string.access/assert.index.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.access/assert.index.pass.cpp
@@ -20,6 +20,7 @@
 
 #include "check_assertion.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 void test() {
@@ -31,6 +32,7 @@ void test() {
 int main(int, char**) {
   test<std::string>();
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 
   return 0;
 }
diff --git a/libcxx/test/libcxx/strings/basic.string/string.capacity/PR53170.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.capacity/PR53170.pass.cpp
index 7bf8043df76d5b1..0475f4b2cfa953f 100644
--- a/libcxx/test/libcxx/strings/basic.string/string.capacity/PR53170.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.capacity/PR53170.pass.cpp
@@ -30,6 +30,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 bool test() {
@@ -74,6 +75,7 @@ int main(int, char**) {
 
 #if TEST_STD_VER >= 11
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
 #if TEST_STD_VER > 17
diff --git a/libcxx/test/libcxx/strings/basic.string/string.cons/copy_shrunk_long.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.cons/copy_shrunk_long.pass.cpp
index d4a0b318f36d728..6eea24490f89657 100644
--- a/libcxx/test/libcxx/strings/basic.string/string.cons/copy_shrunk_long.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.cons/copy_shrunk_long.pass.cpp
@@ -34,12 +34,13 @@ TEST_CONSTEXPR_CXX20 bool test() {
 int main(int, char**) {
   test<std::basic_string<char, std::char_traits<char>, test_allocator<char> > >();
 #if TEST_STD_VER >= 11
-  test<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 #if TEST_STD_VER > 17
-  static_assert(test<std::basic_string<char, std::char_traits<char>, test_allocator<char>>>());
-  static_assert(test<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>());
+  static_assert(test<std::basic_string<char, std::char_traits<char>, test_allocator<char> > >());
+  static_assert(test<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >());
+  static_assert(test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >());
 #endif
-
   return 0;
 }
diff --git a/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.add.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.add.pass.cpp
index 8459284637dc506..c78ac207f46744a 100644
--- a/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.add.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.add.pass.cpp
@@ -18,6 +18,7 @@
 
 #include "check_assertion.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class C>
 void test() {
@@ -32,6 +33,7 @@ void test() {
 int main(int, char**) {
   test<std::string>();
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 
   return 0;
 }
diff --git a/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.compare.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.compare.pass.cpp
index c55410edf4ebac6..aa99d18a0c2014d 100644
--- a/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.compare.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.compare.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "check_assertion.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 void test() {
@@ -28,6 +29,7 @@ void test() {
 int main(int, char**) {
   test<std::string>();
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 
   return 0;
 }
diff --git a/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.decrement.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.decrement.pass.cpp
index f1fa08d006a1e0d..dd0a7420bde8da5 100644
--- a/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.decrement.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.decrement.pass.cpp
@@ -18,6 +18,7 @@
 
 #include "check_assertion.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class C>
 void test() {
@@ -31,6 +32,7 @@ void test() {
 int main(int, char**) {
   test<std::string>();
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 
   return 0;
 }
diff --git a/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.dereference.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.dereference.pass.cpp
index 0bf295c6c4f4fb8..8fab28beb80e635 100644
--- a/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.dereference.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.dereference.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "check_assertion.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class C>
 void test() {
@@ -28,6 +29,7 @@ void test() {
 int main(int, char**) {
   test<std::string>();
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 
   return 0;
 }
diff --git a/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.increment.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.increment.pass.cpp
index 9cc9ab40bcdd659..0c68b416f2ad211 100644
--- a/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.increment.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.increment.pass.cpp
@@ -18,6 +18,7 @@
 
 #include "check_assertion.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class C>
 void test() {
@@ -31,6 +32,7 @@ void test() {
 int main(int, char**) {
   test<std::string>();
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 
   return 0;
 }
diff --git a/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.index.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.index.pass.cpp
index 34060065d204669..4d9aa1a0cc233a8 100644
--- a/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.index.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.index.pass.cpp
@@ -18,6 +18,7 @@
 
 #include "check_assertion.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class C>
 void test() {
@@ -31,6 +32,7 @@ void test() {
 int main(int, char**) {
   test<std::string>();
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 
   return 0;
 }
diff --git a/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.subtract.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.subtract.pass.cpp
index d3274cbd90cc500..2f60065dc324b21 100644
--- a/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.subtract.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.iterators/debug.iterator.subtract.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "check_assertion.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 void test() {
@@ -28,6 +29,7 @@ void test() {
 int main(int, char**) {
   test<std::string>();
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 
   return 0;
 }
diff --git a/libcxx/test/libcxx/strings/basic.string/string.modifiers/assert.erase_iter.null.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.modifiers/assert.erase_iter.null.pass.cpp
index 8c6d704a684b530..07e50e88ea0a8f1 100644
--- a/libcxx/test/libcxx/strings/basic.string/string.modifiers/assert.erase_iter.null.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.modifiers/assert.erase_iter.null.pass.cpp
@@ -19,6 +19,7 @@
 
 #include "check_assertion.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 void test() {
@@ -30,6 +31,7 @@ void test() {
 int main(int, char**) {
   test<std::string>();
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 
   return 0;
 }
diff --git a/libcxx/test/libcxx/strings/basic.string/string.modifiers/assert.pop_back.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.modifiers/assert.pop_back.pass.cpp
index 1bdf3af36743028..f203c4ad8b53ec8 100644
--- a/libcxx/test/libcxx/strings/basic.string/string.modifiers/assert.pop_back.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.modifiers/assert.pop_back.pass.cpp
@@ -18,6 +18,7 @@
 #include <string>
 
 #include "check_assertion.h"
+#include "test_allocator.h"
 
 template <class S>
 void test() {
@@ -27,6 +28,7 @@ void test() {
 
 int main(int, char**) {
   test<std::string>();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 
   return 0;
 }
diff --git a/libcxx/test/libcxx/strings/basic.string/string.modifiers/debug.erase.iter.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.modifiers/debug.erase.iter.pass.cpp
index 93fd6caf0ba2365..4fc4be6bfaf6738 100644
--- a/libcxx/test/libcxx/strings/basic.string/string.modifiers/debug.erase.iter.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.modifiers/debug.erase.iter.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "check_assertion.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 void test() {
@@ -30,6 +31,7 @@ void test() {
 int main(int, char**) {
   test<std::string>();
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 
   return 0;
 }
diff --git a/libcxx/test/libcxx/strings/basic.string/string.modifiers/debug.erase.iter_iter.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.modifiers/debug.erase.iter_iter.pass.cpp
index ed97e21d9411e62..29954095f3b228c 100644
--- a/libcxx/test/libcxx/strings/basic.string/string.modifiers/debug.erase.iter_iter.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.modifiers/debug.erase.iter_iter.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "check_assertion.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 void test() {
@@ -56,6 +57,7 @@ void test() {
 int main(int, char**) {
   test<std::string>();
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 
   return 0;
 }
diff --git a/libcxx/test/libcxx/strings/basic.string/string.modifiers/debug.insert.iter_char.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.modifiers/debug.insert.iter_char.pass.cpp
index 561f79e0e18fb81..946839aea66123d 100644
--- a/libcxx/test/libcxx/strings/basic.string/string.modifiers/debug.insert.iter_char.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.modifiers/debug.insert.iter_char.pass.cpp
@@ -22,6 +22,7 @@
 #include <string>
 
 #include "check_assertion.h"
+#include "test_allocator.h"
 
 template <class S>
 void test() {
@@ -34,6 +35,7 @@ void test() {
 
 int main(int, char**) {
   test<std::string>();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 
   return 0;
 }
diff --git a/libcxx/test/libcxx/strings/basic.string/string.modifiers/debug.insert.iter_iter_iter.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.modifiers/debug.insert.iter_iter_iter.pass.cpp
index eef525349972b92..baff22ee85a4493 100644
--- a/libcxx/test/libcxx/strings/basic.string/string.modifiers/debug.insert.iter_iter_iter.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.modifiers/debug.insert.iter_iter_iter.pass.cpp
@@ -17,6 +17,7 @@
 #include <string>
 
 #include "check_assertion.h"
+#include "test_allocator.h"
 
 template <class S>
 void test() {
@@ -30,6 +31,7 @@ void test() {
 
 int main(int, char**) {
   test<std::string>();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 
   return 0;
 }
diff --git a/libcxx/test/libcxx/strings/basic.string/string.modifiers/debug.insert.iter_size_char.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.modifiers/debug.insert.iter_size_char.pass.cpp
index 4b7532678f2e579..4b1ed1b82ebadea 100644
--- a/libcxx/test/libcxx/strings/basic.string/string.modifiers/debug.insert.iter_size_char.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.modifiers/debug.insert.iter_size_char.pass.cpp
@@ -16,6 +16,7 @@
 #include <string>
 
 #include "check_assertion.h"
+#include "test_allocator.h"
 
 template <class S>
 void test() {
@@ -27,6 +28,7 @@ void test() {
 
 int main(int, char**) {
   test<std::string>();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 
   return 0;
 }
diff --git a/libcxx/test/libcxx/strings/basic.string/string.modifiers/resize_default_initialized.pass.cpp b/libcxx/test/libcxx/strings/basic.string/string.modifiers/resize_default_initialized.pass.cpp
index 8e6e07d659c1a0a..5cc22c4ddfdaf53 100644
--- a/libcxx/test/libcxx/strings/basic.string/string.modifiers/resize_default_initialized.pass.cpp
+++ b/libcxx/test/libcxx/strings/basic.string/string.modifiers/resize_default_initialized.pass.cpp
@@ -14,6 +14,7 @@
 #include <cassert>
 
 #include "test_macros.h"
+#include "test_allocator.h"
 
 TEST_CONSTEXPR_CXX20 void write_c_str(char* buf, int size) {
   for (int i = 0; i < size; ++i) {
@@ -67,8 +68,13 @@ TEST_CONSTEXPR_CXX20 bool test() {
 
 int main(int, char**) {
   test<std::string>();
+#if TEST_STD_VER >= 11
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
+#endif
+
 #if TEST_STD_VER > 17
   static_assert(test<std::string>());
+  static_assert(test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >());
 #endif
 
   return 0;
diff --git a/libcxx/test/std/strings/basic.string.hash/enabled_hashes.pass.cpp b/libcxx/test/std/strings/basic.string.hash/enabled_hashes.pass.cpp
index 611f95f0d3ef6e9..3f382225859cbe5 100644
--- a/libcxx/test/std/strings/basic.string.hash/enabled_hashes.pass.cpp
+++ b/libcxx/test/std/strings/basic.string.hash/enabled_hashes.pass.cpp
@@ -63,6 +63,7 @@ int main(int, char**) {
     test_hash_enabled_for_type<std::u16string>();
     test_hash_enabled_for_type<std::u32string>();
     test_hash_enabled_for_type<std::basic_string<char, std::char_traits<char>, test_allocator<char>>>();
+    test_hash_enabled_for_type<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
     test_hash_disabled_for_type<std::basic_string<MyChar, std::char_traits<MyChar>, std::allocator<MyChar>>>();
     test_hash_disabled_for_type<std::basic_string<char, constexpr_char_traits<char>, std::allocator<char>>>();
   }
diff --git a/libcxx/test/std/strings/basic.string/string.access/at.pass.cpp b/libcxx/test/std/strings/basic.string/string.access/at.pass.cpp
index 52c0646c7d7c568..f1ffeffb11eaeee 100644
--- a/libcxx/test/std/strings/basic.string/string.access/at.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.access/at.pass.cpp
@@ -16,6 +16,7 @@
 #include <cassert>
 
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 #include "make_string.h"
 #include "test_macros.h"
@@ -61,6 +62,7 @@ struct TestCaller {
     test_string<std::basic_string<T> >();
 #if TEST_STD_VER >= 11
     test_string<std::basic_string<T, std::char_traits<T>, min_allocator<T> > >();
+    test_string<std::basic_string<T, std::char_traits<T>, fancy_pointer_allocator<T> > >();
 #endif
   }
 };
diff --git a/libcxx/test/std/strings/basic.string/string.access/back.pass.cpp b/libcxx/test/std/strings/basic.string/string.access/back.pass.cpp
index 2f0c282c8e43650..bcf76d6aa6998eb 100644
--- a/libcxx/test/std/strings/basic.string/string.access/back.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.access/back.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s) {
@@ -40,6 +41,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.access/front.pass.cpp b/libcxx/test/std/strings/basic.string/string.access/front.pass.cpp
index 809b0399dc70fd5..aad6f2db6b7b33b 100644
--- a/libcxx/test/std/strings/basic.string/string.access/front.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.access/front.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s) {
@@ -40,6 +41,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.access/index.pass.cpp b/libcxx/test/std/strings/basic.string/string.access/index.pass.cpp
index 8ba8bf0c8b096bb..9604da6d161e72c 100644
--- a/libcxx/test/std/strings/basic.string/string.access/index.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.access/index.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test_string() {
@@ -59,6 +60,8 @@ TEST_CONSTEXPR_CXX20 bool test() {
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
   test_string_long<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
+  test_string_long<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.capacity/clear.pass.cpp b/libcxx/test/std/strings/basic.string/string.capacity/clear.pass.cpp
index 3a308de9b7569a3..1e1b75a3379b154 100644
--- a/libcxx/test/std/strings/basic.string/string.capacity/clear.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.capacity/clear.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s) {
@@ -40,6 +41,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.capacity/empty.pass.cpp b/libcxx/test/std/strings/basic.string/string.capacity/empty.pass.cpp
index b4700d68a59af24..c8a4914ec3dbbc9 100644
--- a/libcxx/test/std/strings/basic.string/string.capacity/empty.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.capacity/empty.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const S& s) {
@@ -33,6 +34,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.capacity/length.pass.cpp b/libcxx/test/std/strings/basic.string/string.capacity/length.pass.cpp
index e873f82c4830b6e..0f0ff13a67d1c57 100644
--- a/libcxx/test/std/strings/basic.string/string.capacity/length.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.capacity/length.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const S& s) {
@@ -32,6 +33,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.capacity/max_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.capacity/max_size.pass.cpp
index 52dbde45dbb265d..1e0d88e67df467a 100644
--- a/libcxx/test/std/strings/basic.string/string.capacity/max_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.capacity/max_size.pass.cpp
@@ -24,6 +24,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test_resize_max_size_minus_1(const S& s) {
@@ -84,6 +85,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.capacity/over_max_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.capacity/over_max_size.pass.cpp
index 0b459f9625689e7..f3ebef401f2fdc5 100644
--- a/libcxx/test/std/strings/basic.string/string.capacity/over_max_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.capacity/over_max_size.pass.cpp
@@ -24,6 +24,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 void test(const S& s) {
@@ -49,6 +50,7 @@ bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.capacity/reserve.pass.cpp b/libcxx/test/std/strings/basic.string/string.capacity/reserve.pass.cpp
index 03e3cf2f9d7d38e..99ac2570e8ca6d7 100644
--- a/libcxx/test/std/strings/basic.string/string.capacity/reserve.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.capacity/reserve.pass.cpp
@@ -18,6 +18,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 void test(typename S::size_type min_cap, typename S::size_type erased_index) {
@@ -46,6 +47,7 @@ bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.capacity/reserve_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.capacity/reserve_size.pass.cpp
index bb804bf328b3b8d..9910eb11838c6db 100644
--- a/libcxx/test/std/strings/basic.string/string.capacity/reserve_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.capacity/reserve_size.pass.cpp
@@ -20,6 +20,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -77,6 +78,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.capacity/resize_and_overwrite.pass.cpp b/libcxx/test/std/strings/basic.string/string.capacity/resize_and_overwrite.pass.cpp
index bbe6551a0ff1181..a7ae6fb1270e92f 100644
--- a/libcxx/test/std/strings/basic.string/string.capacity/resize_and_overwrite.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.capacity/resize_and_overwrite.pass.cpp
@@ -19,6 +19,7 @@
 
 #include "make_string.h"
 #include "test_macros.h"
+#include "test_allocator.h"
 
 template <class S>
 constexpr void test_appending(std::size_t k, size_t N, size_t new_capacity) {
@@ -85,18 +86,35 @@ void test_value_categories() {
 
 int main(int, char**) {
   test<std::basic_string<char, std::char_traits<char>, std::allocator<char>>>();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
+
   test<std::basic_string<char8_t, std::char_traits<char8_t>, std::allocator<char8_t>>>();
+  test<std::basic_string<char8_t, std::char_traits<char8_t>, fancy_pointer_allocator<char8_t>>>();
+
   test<std::basic_string<char16_t, std::char_traits<char16_t>, std::allocator<char16_t>>>();
+  test<std::basic_string<char16_t, std::char_traits<char16_t>, fancy_pointer_allocator<char16_t>>>();
+
   test<std::basic_string<char32_t, std::char_traits<char32_t>, std::allocator<char32_t>>>();
+  test<std::basic_string<char32_t, std::char_traits<char32_t>, fancy_pointer_allocator<char32_t>>>();
 
   static_assert(test<std::basic_string<char, std::char_traits<char>, std::allocator<char>>>());
+  static_assert(test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>());
+
   static_assert(test<std::basic_string<char8_t, std::char_traits<char8_t>, std::allocator<char8_t>>>());
+  static_assert(test<std::basic_string<char8_t, std::char_traits<char8_t>, fancy_pointer_allocator<char8_t>>>());
+
   static_assert(test<std::basic_string<char16_t, std::char_traits<char16_t>, std::allocator<char16_t>>>());
+  static_assert(test<std::basic_string<char16_t, std::char_traits<char16_t>, fancy_pointer_allocator<char16_t>>>());
+
   static_assert(test<std::basic_string<char32_t, std::char_traits<char32_t>, std::allocator<char32_t>>>());
+  static_assert(test<std::basic_string<char32_t, std::char_traits<char32_t>, fancy_pointer_allocator<char32_t>>>());
 
 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
   test<std::basic_string<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t>>>();
+  test<std::basic_string<wchar_t, std::char_traits<wchar_t>, fancy_pointer_allocator<wchar_t>>>();
+
   static_assert(test<std::basic_string<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t>>>());
+  static_assert(test<std::basic_string<wchar_t, std::char_traits<wchar_t>, fancy_pointer_allocator<wchar_t>>>());
 #endif
   return 0;
 }
diff --git a/libcxx/test/std/strings/basic.string/string.capacity/resize_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.capacity/resize_size.pass.cpp
index 487b12d9df87f33..12b85566be5175d 100644
--- a/libcxx/test/std/strings/basic.string/string.capacity/resize_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.capacity/resize_size.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s, typename S::size_type n, S expected) {
@@ -61,6 +62,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.capacity/resize_size_char.pass.cpp b/libcxx/test/std/strings/basic.string/string.capacity/resize_size_char.pass.cpp
index 3b6adc0b0afeb19..3b0f1e9fb4f4cd8 100644
--- a/libcxx/test/std/strings/basic.string/string.capacity/resize_size_char.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.capacity/resize_size_char.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s, typename S::size_type n, typename S::value_type c, S expected) {
@@ -63,6 +64,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.capacity/shrink_to_fit.pass.cpp b/libcxx/test/std/strings/basic.string/string.capacity/shrink_to_fit.pass.cpp
index 1efebfc9cea561b..b7db5a062c4b3d2 100644
--- a/libcxx/test/std/strings/basic.string/string.capacity/shrink_to_fit.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.capacity/shrink_to_fit.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s) {
@@ -45,6 +46,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.capacity/size.pass.cpp b/libcxx/test/std/strings/basic.string/string.capacity/size.pass.cpp
index 9d53971779b6480..e1be04a13427c5b 100644
--- a/libcxx/test/std/strings/basic.string/string.capacity/size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.capacity/size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const S& s, typename S::size_type c) {
@@ -32,6 +33,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.cons/T_size_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/T_size_size.pass.cpp
index a6b625b7b0e8113..25fd7c268a67af4 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/T_size_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/T_size_size.pass.cpp
@@ -113,6 +113,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string(test_allocator<char>(8));
 #if TEST_STD_VER >= 11
   test_string(min_allocator<char>());
+  test_string(fancy_pointer_allocator<char>());
 #endif
 
   {
diff --git a/libcxx/test/std/strings/basic.string/string.cons/alloc.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/alloc.pass.cpp
index 97a0566ba031b00..24036b926d1e891 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/alloc.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/alloc.pass.cpp
@@ -16,6 +16,7 @@
 #include "test_macros.h"
 #include "test_allocator.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test() {
@@ -89,6 +90,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test<std::basic_string<char, std::char_traits<char>, test_allocator<char> > >();
 #if TEST_STD_VER >= 11
   test2<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test2<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
   test2<std::basic_string<char, std::char_traits<char>, explicit_allocator<char> > >();
 #endif
 
diff --git a/libcxx/test/std/strings/basic.string/string.cons/char_assignment.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/char_assignment.pass.cpp
index 3cffc82e9483526..591122538ab7ede 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/char_assignment.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/char_assignment.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s1, typename S::value_type s2) {
@@ -38,6 +39,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.cons/copy.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/copy.pass.cpp
index 3afe76e88316f99..99b270a3451d575 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/copy.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/copy.pass.cpp
@@ -40,6 +40,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string(test_allocator<char>(3));
 #if TEST_STD_VER >= 11
   test_string(min_allocator<char>());
+  test_string(fancy_pointer_allocator<char>());
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.cons/copy_alloc.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/copy_alloc.pass.cpp
index 6b0040376a424ec..a8c65c653e47a5e 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/copy_alloc.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/copy_alloc.pass.cpp
@@ -99,6 +99,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string(test_allocator<char>(3));
 #if TEST_STD_VER >= 11
   test_string(min_allocator<char>());
+  test_string(fancy_pointer_allocator<char>());
 #endif
 
 #if TEST_STD_VER >= 11
diff --git a/libcxx/test/std/strings/basic.string/string.cons/copy_assignment.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/copy_assignment.pass.cpp
index 8d0fcb3c6d2943f..7f89bbf5e0e892c 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/copy_assignment.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/copy_assignment.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s1, const S& s2) {
@@ -46,6 +47,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
 #if TEST_STD_VER >= 11
diff --git a/libcxx/test/std/strings/basic.string/string.cons/default.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/default.pass.cpp
index 3993a40dd5a165c..7f41154a098d212 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/default.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/default.pass.cpp
@@ -22,6 +22,9 @@ LIBCPP_STATIC_ASSERT(std::is_nothrow_default_constructible<std::string>::value,
 LIBCPP_STATIC_ASSERT(std::is_nothrow_default_constructible<
                          std::basic_string<char, std::char_traits<char>, test_allocator<char>>>::value,
                      "");
+LIBCPP_STATIC_ASSERT(std::is_nothrow_default_constructible<
+                         std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>::value,
+                     "");
 LIBCPP_STATIC_ASSERT(!std::is_nothrow_default_constructible<
                          std::basic_string<char, std::char_traits<char>, limited_allocator<char, 10>>>::value,
                      "");
diff --git a/libcxx/test/std/strings/basic.string/string.cons/dtor.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/dtor.pass.cpp
index e9f174068473d55..ab799e809048403 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/dtor.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/dtor.pass.cpp
@@ -36,6 +36,9 @@ std::wstring unused_wide_string;
 static_assert(std::is_nothrow_destructible<std::string>::value, "");
 static_assert(
     std::is_nothrow_destructible< std::basic_string<char, std::char_traits<char>, test_allocator<char>>>::value, "");
+static_assert(std::is_nothrow_destructible<
+                  std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>::value,
+              "");
 LIBCPP_STATIC_ASSERT(
     !std::is_nothrow_destructible< std::basic_string<char, std::char_traits<char>, throwing_alloc<char>>>::value, "");
 
diff --git a/libcxx/test/std/strings/basic.string/string.cons/initializer_list.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/initializer_list.pass.cpp
index 5b7e8bde2e6e877..b6f258c7dfd5de3 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/initializer_list.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/initializer_list.pass.cpp
@@ -38,6 +38,7 @@ TEST_CONSTEXPR_CXX20 void test_string() {
 TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::allocator>();
   test_string<min_allocator>();
+  test_string<fancy_pointer_allocator>();
 
   return true;
 }
diff --git a/libcxx/test/std/strings/basic.string/string.cons/initializer_list_assignment.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/initializer_list_assignment.pass.cpp
index 88597daba121ac4..44e0966e029c715 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/initializer_list_assignment.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/initializer_list_assignment.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 // clang-format off
 template <template <class> class Alloc>
@@ -43,6 +44,7 @@ TEST_CONSTEXPR_CXX20 void test_string() {
 TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::allocator>();
   test_string<min_allocator>();
+  test_string<fancy_pointer_allocator>();
 
   return true;
 }
diff --git a/libcxx/test/std/strings/basic.string/string.cons/iter_alloc.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/iter_alloc.pass.cpp
index 2ef73e5ec8c1ade..db0973476812dae 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/iter_alloc.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/iter_alloc.pass.cpp
@@ -90,6 +90,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string(test_allocator<char>(2));
 #if TEST_STD_VER >= 11
   test_string(min_allocator<char>());
+  test_string(fancy_pointer_allocator<char>());
 #endif
   {
     static_assert((!std::is_constructible<std::string, std::string, std::string>::value), "");
diff --git a/libcxx/test/std/strings/basic.string/string.cons/iter_alloc_deduction.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/iter_alloc_deduction.pass.cpp
index 65762ccf89d9304..9d0b76a4ff4677d 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/iter_alloc_deduction.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/iter_alloc_deduction.pass.cpp
@@ -99,6 +99,16 @@ TEST_CONSTEXPR_CXX20 bool test() {
     assert(s1.size() == 10);
     assert(s1.compare(0, s1.size(), s, s1.size()) == 0);
   }
+  {
+    const char16_t* s = u"12345678901234";
+    std::basic_string s1{s, s + 10, fancy_pointer_allocator<char16_t>{}};
+    using S = decltype(s1); // what type did we get?
+    static_assert(std::is_same_v<S::value_type, char16_t>, "");
+    static_assert(std::is_same_v<S::traits_type, std::char_traits<char16_t>>, "");
+    static_assert(std::is_same_v<S::allocator_type, fancy_pointer_allocator<char16_t>>, "");
+    assert(s1.size() == 10);
+    assert(s1.compare(0, s1.size(), s, s1.size()) == 0);
+  }
   {
     const char32_t* s = U"12345678901234";
     std::basic_string s1{s, s + 10, explicit_allocator<char32_t>{}};
@@ -109,6 +119,16 @@ TEST_CONSTEXPR_CXX20 bool test() {
     assert(s1.size() == 10);
     assert(s1.compare(0, s1.size(), s, s1.size()) == 0);
   }
+  {
+    const char32_t* s = U"12345678901234";
+    std::basic_string s1{s, s + 10, fancy_pointer_allocator<char32_t>{}};
+    using S = decltype(s1); // what type did we get?
+    static_assert(std::is_same_v<S::value_type, char32_t>, "");
+    static_assert(std::is_same_v<S::traits_type, std::char_traits<char32_t>>, "");
+    static_assert(std::is_same_v<S::allocator_type, fancy_pointer_allocator<char32_t>>, "");
+    assert(s1.size() == 10);
+    assert(s1.compare(0, s1.size(), s, s1.size()) == 0);
+  }
 
   return true;
 }
diff --git a/libcxx/test/std/strings/basic.string/string.cons/move.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/move.pass.cpp
index f5ffebd35d50e92..8fdee1642d14d70 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/move.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/move.pass.cpp
@@ -43,6 +43,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string(test_allocator<char>());
   test_string(test_allocator<char>(3));
   test_string(min_allocator<char>());
+  test_string(fancy_pointer_allocator<char>());
 
   return true;
 }
diff --git a/libcxx/test/std/strings/basic.string/string.cons/move_alloc.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/move_alloc.pass.cpp
index 0e5c72192adea64..844e66038798243 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/move_alloc.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/move_alloc.pass.cpp
@@ -70,6 +70,18 @@ TEST_CONSTEXPR_CXX20 bool test() {
     test(S("1"), A());
     test(S("1234567890123456789012345678901234567890123456789012345678901234567890"), A());
   }
+  {
+    typedef fancy_pointer_allocator<char> A;
+    typedef std::basic_string<char, std::char_traits<char>, A> S;
+#if TEST_STD_VER > 14
+    static_assert((noexcept(S{})), "");
+#elif TEST_STD_VER >= 11
+    static_assert((noexcept(S()) == std::is_nothrow_move_constructible<A>::value), "");
+#endif
+    test(S(), A());
+    test(S("1"), A());
+    test(S("1234567890123456789012345678901234567890123456789012345678901234567890"), A());
+  }
 
   return true;
 }
diff --git a/libcxx/test/std/strings/basic.string/string.cons/move_assign_noexcept.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/move_assign_noexcept.pass.cpp
index bba86b3acffee8b..551de2b3f4a669b 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/move_assign_noexcept.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/move_assign_noexcept.pass.cpp
@@ -68,6 +68,10 @@ TEST_CONSTEXPR_CXX20 bool test() {
     typedef std::basic_string<char, std::char_traits<char>, test_allocator<char>> C;
     static_assert(!std::is_nothrow_move_assignable<C>::value, "");
   }
+  {
+    typedef std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>> C;
+    static_assert(std::is_nothrow_move_assignable<C>::value, "");
+  }
   {
     typedef std::basic_string<char, std::char_traits<char>, some_alloc<char>> C;
 #if TEST_STD_VER > 14
diff --git a/libcxx/test/std/strings/basic.string/string.cons/move_assignment.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/move_assignment.pass.cpp
index 89cb44d62ef2b6c..aa9465d46a6ee7a 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/move_assignment.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/move_assignment.pass.cpp
@@ -51,6 +51,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.cons/move_noexcept.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/move_noexcept.pass.cpp
index d807cac2c72c848..c408508e8f21a25 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/move_noexcept.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/move_noexcept.pass.cpp
@@ -30,6 +30,10 @@ int main(int, char**) {
     typedef std::basic_string<char, std::char_traits<char>, test_allocator<char>> C;
     static_assert(std::is_nothrow_move_constructible<C>::value, "");
   }
+  {
+    typedef std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>> C;
+    static_assert(std::is_nothrow_move_constructible<C>::value, "");
+  }
   {
     typedef std::basic_string<char, std::char_traits<char>, limited_allocator<char, 10>> C;
 #if TEST_STD_VER <= 14
diff --git a/libcxx/test/std/strings/basic.string/string.cons/pointer_alloc.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/pointer_alloc.pass.cpp
index 84a29df5b57bf16..d8b8cbfc3f628fb 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/pointer_alloc.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/pointer_alloc.pass.cpp
@@ -67,6 +67,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test(test_allocator<char>(2));
 #if TEST_STD_VER >= 11
   test(min_allocator<char>());
+  test(fancy_pointer_allocator<char>());
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.cons/pointer_assignment.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/pointer_assignment.pass.cpp
index 4b3027a2aad1183..8f650bb2ac19183 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/pointer_assignment.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/pointer_assignment.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s1, const typename S::value_type* s2) {
@@ -48,6 +49,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.cons/pointer_size_alloc.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/pointer_size_alloc.pass.cpp
index e0dab72b5c6327e..8a0febc8a08b14a 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/pointer_size_alloc.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/pointer_size_alloc.pass.cpp
@@ -64,6 +64,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test(test_allocator<char>(2));
 #if TEST_STD_VER >= 11
   test(min_allocator<char>());
+  test(fancy_pointer_allocator<char>());
 #endif
 
 #if TEST_STD_VER >= 11
diff --git a/libcxx/test/std/strings/basic.string/string.cons/size_char_alloc.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/size_char_alloc.pass.cpp
index 3afbcdffa6bdfe3..60b613564f87f2b 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/size_char_alloc.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/size_char_alloc.pass.cpp
@@ -94,6 +94,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string(test_allocator<char>(2));
 #if TEST_STD_VER >= 11
   test_string(min_allocator<char>());
+  test_string(fancy_pointer_allocator<char>());
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.cons/string_view.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/string_view.pass.cpp
index 74fa76a013a6926..dd08c5e5e3534ed 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/string_view.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/string_view.pass.cpp
@@ -93,6 +93,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string(test_allocator<char>(2));
 #if TEST_STD_VER >= 11
   test_string(min_allocator<char>());
+  test_string(fancy_pointer_allocator<char>());
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.cons/string_view_assignment.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/string_view_assignment.pass.cpp
index 3c88f9e40fc0b3b..66119b177e3db1c 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/string_view_assignment.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/string_view_assignment.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class SV>
 TEST_CONSTEXPR_CXX20 void test(S s1, SV sv) {
@@ -48,6 +49,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.cons/string_view_deduction.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/string_view_deduction.pass.cpp
index 3a6f84f2699aca6..a5287a233213636 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/string_view_deduction.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/string_view_deduction.pass.cpp
@@ -66,6 +66,16 @@ TEST_CONSTEXPR_CXX20 bool test() {
     assert(s1.size() == sv.size());
     assert(s1.compare(0, s1.size(), sv.data(), s1.size()) == 0);
   }
+  {
+    std::string_view sv = "12345678901234";
+    std::basic_string s1{sv, fancy_pointer_allocator<char>{}};
+    using S = decltype(s1); // what type did we get?
+    static_assert(std::is_same_v<S::value_type, char>, "");
+    static_assert(std::is_same_v<S::traits_type, std::char_traits<char>>, "");
+    static_assert(std::is_same_v<S::allocator_type, fancy_pointer_allocator<char>>, "");
+    assert(s1.size() == sv.size());
+    assert(s1.compare(0, s1.size(), sv.data(), s1.size()) == 0);
+  }
 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
   {
     std::wstring_view sv = L"12345678901234";
@@ -77,6 +87,16 @@ TEST_CONSTEXPR_CXX20 bool test() {
     assert(s1.size() == sv.size());
     assert(s1.compare(0, s1.size(), sv.data(), s1.size()) == 0);
   }
+  {
+    std::wstring_view sv = L"12345678901234";
+    std::basic_string s1{sv, fancy_pointer_allocator<wchar_t>{}};
+    using S = decltype(s1); // what type did we get?
+    static_assert(std::is_same_v<S::value_type, wchar_t>, "");
+    static_assert(std::is_same_v<S::traits_type, std::char_traits<wchar_t>>, "");
+    static_assert(std::is_same_v<S::allocator_type, fancy_pointer_allocator<wchar_t>>, "");
+    assert(s1.size() == sv.size());
+    assert(s1.compare(0, s1.size(), sv.data(), s1.size()) == 0);
+  }
 #endif
 #ifndef TEST_HAS_NO_CHAR8_T
   {
@@ -89,6 +109,16 @@ TEST_CONSTEXPR_CXX20 bool test() {
     assert(s1.size() == sv.size());
     assert(s1.compare(0, s1.size(), sv.data(), s1.size()) == 0);
   }
+  {
+    std::u8string_view sv = u8"12345678901234";
+    std::basic_string s1{sv, fancy_pointer_allocator<char8_t>{}};
+    using S = decltype(s1); // what type did we get?
+    static_assert(std::is_same_v<S::value_type, char8_t>, "");
+    static_assert(std::is_same_v<S::traits_type, std::char_traits<char8_t>>, "");
+    static_assert(std::is_same_v<S::allocator_type, fancy_pointer_allocator<char8_t>>, "");
+    assert(s1.size() == sv.size());
+    assert(s1.compare(0, s1.size(), sv.data(), s1.size()) == 0);
+  }
 #endif
   {
     std::u16string_view sv = u"12345678901234";
@@ -100,6 +130,16 @@ TEST_CONSTEXPR_CXX20 bool test() {
     assert(s1.size() == sv.size());
     assert(s1.compare(0, s1.size(), sv.data(), s1.size()) == 0);
   }
+  {
+    std::u16string_view sv = u"12345678901234";
+    std::basic_string s1{sv, fancy_pointer_allocator<char16_t>{}};
+    using S = decltype(s1); // what type did we get?
+    static_assert(std::is_same_v<S::value_type, char16_t>, "");
+    static_assert(std::is_same_v<S::traits_type, std::char_traits<char16_t>>, "");
+    static_assert(std::is_same_v<S::allocator_type, fancy_pointer_allocator<char16_t>>, "");
+    assert(s1.size() == sv.size());
+    assert(s1.compare(0, s1.size(), sv.data(), s1.size()) == 0);
+  }
   {
     std::u32string_view sv = U"12345678901234";
     std::basic_string s1{sv, explicit_allocator<char32_t>{}};
diff --git a/libcxx/test/std/strings/basic.string/string.cons/string_view_size_size_deduction.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/string_view_size_size_deduction.pass.cpp
index 08e696b7a091bd4..c32bdb748be4de3 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/string_view_size_size_deduction.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/string_view_size_size_deduction.pass.cpp
@@ -73,6 +73,16 @@ TEST_CONSTEXPR_CXX20 bool test() {
     assert(s1.size() == 4);
     assert(s1.compare(0, s1.size(), sv.data(), s1.size()) == 0);
   }
+  {
+    std::string_view sv = "12345678901234";
+    std::basic_string s1{sv, 0, 4, fancy_pointer_allocator<char>{}};
+    using S = decltype(s1); // what type did we get?
+    static_assert(std::is_same_v<S::value_type, char>, "");
+    static_assert(std::is_same_v<S::traits_type, std::char_traits<char>>, "");
+    static_assert(std::is_same_v<S::allocator_type, fancy_pointer_allocator<char>>, "");
+    assert(s1.size() == 4);
+    assert(s1.compare(0, s1.size(), sv.data(), s1.size()) == 0);
+  }
 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
   {
     std::wstring_view sv = L"12345678901234";
@@ -84,6 +94,16 @@ TEST_CONSTEXPR_CXX20 bool test() {
     assert(s1.size() == 4);
     assert(s1.compare(0, s1.size(), sv.data(), s1.size()) == 0);
   }
+  {
+    std::wstring_view sv = L"12345678901234";
+    std::basic_string s1{sv, 0, 4, fancy_pointer_allocator<wchar_t>{}};
+    using S = decltype(s1); // what type did we get?
+    static_assert(std::is_same_v<S::value_type, wchar_t>, "");
+    static_assert(std::is_same_v<S::traits_type, std::char_traits<wchar_t>>, "");
+    static_assert(std::is_same_v<S::allocator_type, fancy_pointer_allocator<wchar_t>>, "");
+    assert(s1.size() == 4);
+    assert(s1.compare(0, s1.size(), sv.data(), s1.size()) == 0);
+  }
 #endif
 #ifndef TEST_HAS_NO_CHAR8_T
   {
@@ -96,6 +116,16 @@ TEST_CONSTEXPR_CXX20 bool test() {
     assert(s1.size() == 4);
     assert(s1.compare(0, s1.size(), sv.data(), s1.size()) == 0);
   }
+  {
+    std::u8string_view sv = u8"12345678901234";
+    std::basic_string s1{sv, 0, 4, fancy_pointer_allocator<char8_t>{}};
+    using S = decltype(s1); // what type did we get?
+    static_assert(std::is_same_v<S::value_type, char8_t>, "");
+    static_assert(std::is_same_v<S::traits_type, std::char_traits<char8_t>>, "");
+    static_assert(std::is_same_v<S::allocator_type, fancy_pointer_allocator<char8_t>>, "");
+    assert(s1.size() == 4);
+    assert(s1.compare(0, s1.size(), sv.data(), s1.size()) == 0);
+  }
 #endif
   {
     std::u16string_view sv = u"12345678901234";
@@ -107,6 +137,16 @@ TEST_CONSTEXPR_CXX20 bool test() {
     assert(s1.size() == 4);
     assert(s1.compare(0, s1.size(), sv.data(), s1.size()) == 0);
   }
+  {
+    std::u16string_view sv = u"12345678901234";
+    std::basic_string s1{sv, 0, 4, fancy_pointer_allocator<char16_t>{}};
+    using S = decltype(s1); // what type did we get?
+    static_assert(std::is_same_v<S::value_type, char16_t>, "");
+    static_assert(std::is_same_v<S::traits_type, std::char_traits<char16_t>>, "");
+    static_assert(std::is_same_v<S::allocator_type, fancy_pointer_allocator<char16_t>>, "");
+    assert(s1.size() == 4);
+    assert(s1.compare(0, s1.size(), sv.data(), s1.size()) == 0);
+  }
   {
     std::u32string_view sv = U"12345678901234";
     std::basic_string s1{sv, 0, 4, explicit_allocator<char32_t>{}};
diff --git a/libcxx/test/std/strings/basic.string/string.cons/substr.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/substr.pass.cpp
index 693edab76b17b0c..224283d0b9ac658 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/substr.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/substr.pass.cpp
@@ -164,6 +164,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string(test_allocator<char>(3), test_allocator<char>(5));
 #if TEST_STD_VER >= 11
   test_string(min_allocator<char>(), min_allocator<char>());
+  test_string(fancy_pointer_allocator<char>(), fancy_pointer_allocator<char>());
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.cons/substr_rvalue.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/substr_rvalue.pass.cpp
index 272ce339f3adc61..fcc472c80486264 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/substr_rvalue.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/substr_rvalue.pass.cpp
@@ -203,6 +203,7 @@ constexpr void test_allocators() {
   test_string<std::basic_string<CharT, CharTraits, std::allocator<CharT>>>(std::allocator<CharT>{});
   test_string<std::basic_string<CharT, CharTraits, min_allocator<CharT>>>(min_allocator<CharT>{});
   test_string<std::basic_string<CharT, CharTraits, test_allocator<CharT>>>(test_allocator<CharT>{42});
+  test_string<std::basic_string<CharT, CharTraits, fancy_pointer_allocator<CharT>>>(fancy_pointer_allocator<CharT>{});
 }
 
 template <class CharT>
diff --git a/libcxx/test/std/strings/basic.string/string.contains/contains.char.pass.cpp b/libcxx/test/std/strings/basic.string/string.contains/contains.char.pass.cpp
index 658af8e2cd64967..d9ea3c98633fe6a 100644
--- a/libcxx/test/std/strings/basic.string/string.contains/contains.char.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.contains/contains.char.pass.cpp
@@ -15,6 +15,7 @@
 #include <cassert>
 
 #include "test_macros.h"
+#include "test_allocator.h"
 
 template <class S>
 constexpr void test_string() {
@@ -33,6 +34,7 @@ constexpr void test_string() {
 
 constexpr bool test() {
   test_string<std::string>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 
   return true;
 }
diff --git a/libcxx/test/std/strings/basic.string/string.contains/contains.ptr.pass.cpp b/libcxx/test/std/strings/basic.string/string.contains/contains.ptr.pass.cpp
index 99f400fa0c37b38..ada28b9611d403d 100644
--- a/libcxx/test/std/strings/basic.string/string.contains/contains.ptr.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.contains/contains.ptr.pass.cpp
@@ -15,6 +15,7 @@
 #include <cassert>
 
 #include "test_macros.h"
+#include "test_allocator.h"
 
 template <class S>
 constexpr void test_string() {
@@ -63,6 +64,7 @@ constexpr void test_string() {
 
 constexpr bool test() {
   test_string<std::string>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 
   return true;
 }
diff --git a/libcxx/test/std/strings/basic.string/string.contains/contains.string_view.pass.cpp b/libcxx/test/std/strings/basic.string/string.contains/contains.string_view.pass.cpp
index 619a718794b14e1..192702913070a22 100644
--- a/libcxx/test/std/strings/basic.string/string.contains/contains.string_view.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.contains/contains.string_view.pass.cpp
@@ -15,6 +15,7 @@
 #include <cassert>
 
 #include "test_macros.h"
+#include "test_allocator.h"
 
 template <class CharT, template <class> class Alloc>
 constexpr void test_string() {
@@ -86,6 +87,7 @@ constexpr void test_string() {
 
 constexpr bool test() {
   test_string<char, std::allocator>();
+  test_string<char, fancy_pointer_allocator>();
 
   return true;
 }
diff --git a/libcxx/test/std/strings/basic.string/string.ends_with/ends_with.char.pass.cpp b/libcxx/test/std/strings/basic.string/string.ends_with/ends_with.char.pass.cpp
index a9547ec4f3af3fd..734954131a2d9c4 100644
--- a/libcxx/test/std/strings/basic.string/string.ends_with/ends_with.char.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ends_with/ends_with.char.pass.cpp
@@ -15,6 +15,7 @@
 #include <cassert>
 
 #include "test_macros.h"
+#include "test_allocator.h"
 
 template <class S>
 constexpr void test_string() {
@@ -31,6 +32,7 @@ constexpr void test_string() {
 
 constexpr bool test() {
   test_string<std::string>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 
   return true;
 }
diff --git a/libcxx/test/std/strings/basic.string/string.ends_with/ends_with.ptr.pass.cpp b/libcxx/test/std/strings/basic.string/string.ends_with/ends_with.ptr.pass.cpp
index 23331967d1c730a..006bc7664e6b6d9 100644
--- a/libcxx/test/std/strings/basic.string/string.ends_with/ends_with.ptr.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ends_with/ends_with.ptr.pass.cpp
@@ -15,6 +15,7 @@
 #include <cassert>
 
 #include "test_macros.h"
+#include "test_allocator.h"
 
 template <class S>
 constexpr void test_string() {
@@ -60,6 +61,7 @@ constexpr void test_string() {
 
 constexpr bool test() {
   test_string<std::string>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 
   return true;
 }
diff --git a/libcxx/test/std/strings/basic.string/string.ends_with/ends_with.string_view.pass.cpp b/libcxx/test/std/strings/basic.string/string.ends_with/ends_with.string_view.pass.cpp
index 683a16a2fc536af..5ee06c31671850a 100644
--- a/libcxx/test/std/strings/basic.string/string.ends_with/ends_with.string_view.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ends_with/ends_with.string_view.pass.cpp
@@ -15,6 +15,7 @@
 #include <cassert>
 
 #include "test_macros.h"
+#include "test_allocator.h"
 
 template <class CharT, template <class> class Alloc>
 constexpr void test_string() {
@@ -70,6 +71,7 @@ constexpr void test_string() {
 
 constexpr bool test() {
   test_string<char, std::allocator>();
+  test_string<char, fancy_pointer_allocator>();
 
   return true;
 }
diff --git a/libcxx/test/std/strings/basic.string/string.iterators/begin.pass.cpp b/libcxx/test/std/strings/basic.string/string.iterators/begin.pass.cpp
index 202a87dd777b3b3..0da516f14b65ed2 100644
--- a/libcxx/test/std/strings/basic.string/string.iterators/begin.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.iterators/begin.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s) {
@@ -38,6 +39,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.iterators/cbegin.pass.cpp b/libcxx/test/std/strings/basic.string/string.iterators/cbegin.pass.cpp
index df2c38476197ed1..cd3afb59789bd39 100644
--- a/libcxx/test/std/strings/basic.string/string.iterators/cbegin.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.iterators/cbegin.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const S& s) {
@@ -35,6 +36,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.iterators/cend.pass.cpp b/libcxx/test/std/strings/basic.string/string.iterators/cend.pass.cpp
index 31d06725e5107db..b794408e5ebee84 100644
--- a/libcxx/test/std/strings/basic.string/string.iterators/cend.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.iterators/cend.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const S& s) {
@@ -32,6 +33,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.iterators/crbegin.pass.cpp b/libcxx/test/std/strings/basic.string/string.iterators/crbegin.pass.cpp
index 85b33afeb403eb6..84aae817b597e69 100644
--- a/libcxx/test/std/strings/basic.string/string.iterators/crbegin.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.iterators/crbegin.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const S& s) {
@@ -35,6 +36,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.iterators/crend.pass.cpp b/libcxx/test/std/strings/basic.string/string.iterators/crend.pass.cpp
index 5d1f90c409bc403..3e40a30f7503845 100644
--- a/libcxx/test/std/strings/basic.string/string.iterators/crend.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.iterators/crend.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const S& s) {
@@ -32,6 +33,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.iterators/end.pass.cpp b/libcxx/test/std/strings/basic.string/string.iterators/end.pass.cpp
index 2c3e3b12872157e..2a72ed0326efd8a 100644
--- a/libcxx/test/std/strings/basic.string/string.iterators/end.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.iterators/end.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s) {
@@ -41,6 +42,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.iterators/rbegin.pass.cpp b/libcxx/test/std/strings/basic.string/string.iterators/rbegin.pass.cpp
index feaea2f65790c77..c07ccb1faf6c20c 100644
--- a/libcxx/test/std/strings/basic.string/string.iterators/rbegin.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.iterators/rbegin.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s) {
@@ -38,6 +39,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.iterators/rend.pass.cpp b/libcxx/test/std/strings/basic.string/string.iterators/rend.pass.cpp
index d34ee26fd9d04b7..1e20f95cd9d9873 100644
--- a/libcxx/test/std/strings/basic.string/string.iterators/rend.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.iterators/rend.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s) {
@@ -41,6 +42,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/robust_against_adl.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/robust_against_adl.pass.cpp
index a02b455ce1fe62c..9802838609327a1 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/robust_against_adl.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/robust_against_adl.pass.cpp
@@ -12,6 +12,7 @@
 #include <string>
 
 #include "test_macros.h"
+#include "test_allocator.h"
 
 struct Incomplete;
 template <class T>
@@ -39,6 +40,9 @@ TEST_CONSTEXPR_CXX20 void test_string() {
 
 TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
+#if TEST_STD_VER >= 11
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
+#endif
 
   return true;
 }
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_append/T_size_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_append/T_size_size.pass.cpp
index cf45b368ebbcaf6..8da8417f2e25dbb 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_append/T_size_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_append/T_size_size.pass.cpp
@@ -18,6 +18,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class SV>
 TEST_CONSTEXPR_CXX20 void test(S s, SV sv, typename S::size_type pos, typename S::size_type n, S expected) {
@@ -86,6 +87,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   {
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_append/initializer_list.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_append/initializer_list.pass.cpp
index 6c5049f16bc6192..a6f08704e73bc8c 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_append/initializer_list.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_append/initializer_list.pass.cpp
@@ -18,6 +18,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 #include "nasty_string.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test() {
@@ -40,6 +41,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test<std::u32string>();
 
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #ifndef TEST_HAS_NO_NASTY_STRING
   test<nasty_string>();
 #endif
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_append/iterator.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_append/iterator.pass.cpp
index 2982cfe77042c0d..e774e0d3c0e058f 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_append/iterator.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_append/iterator.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "test_iterators.h"
+#include "test_allocator.h"
 #include "min_allocator.h"
 
 template <class S, class It>
@@ -224,7 +225,8 @@ TEST_CONSTEXPR_CXX20 void test_string() {
 TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
-  test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_append/pointer.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_append/pointer.pass.cpp
index 68f5838ccf2f02a..38fb32d4bc9d1fb 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_append/pointer.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_append/pointer.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s, const typename S::value_type* str, S expected) {
@@ -43,6 +44,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   { // test appending to self
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_append/pointer_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_append/pointer_size.pass.cpp
index b98c91cf097b1a0..71295ebb98a6c63 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_append/pointer_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_append/pointer_size.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s, const typename S::value_type* str, typename S::size_type n, S expected) {
@@ -48,6 +49,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   { // test appending to self
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_append/push_back.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_append/push_back.pass.cpp
index 0b8e5f65c15e94d..bd1be8dca3306c5 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_append/push_back.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_append/push_back.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 struct VeryLarge {
   long long a;
@@ -74,6 +75,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
   {
     // https://llvm.org/PR31454
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_append/size_char.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_append/size_char.pass.cpp
index eb0728456df5be4..5b5fa52d1b29a8f 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_append/size_char.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_append/size_char.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s, typename S::size_type n, typename S::value_type c, S expected) {
@@ -44,6 +45,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_append/string.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_append/string.pass.cpp
index 21f2ff53004d158..71b030d54bfb90c 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_append/string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_append/string.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s, S str, S expected) {
@@ -51,6 +52,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
 #if TEST_STD_VER >= 11
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_append/string_size_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_append/string_size_size.pass.cpp
index 902d29c53ac69f5..956c465fe8aa596 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_append/string_size_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_append/string_size_size.pass.cpp
@@ -18,6 +18,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s, S str, typename S::size_type pos, typename S::size_type n, S expected) {
@@ -85,6 +86,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   {
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_append/string_view.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_append/string_view.pass.cpp
index c09cdde1bc105e3..b6bdb1c9c163434 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_append/string_view.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_append/string_view.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class SV>
 TEST_CONSTEXPR_CXX20 void test(S s, SV sv, S expected) {
@@ -53,6 +54,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/T_size_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/T_size_size.pass.cpp
index a2a954cb94aac6a..606d55fd3eccf0f 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/T_size_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/T_size_size.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class SV>
 TEST_CONSTEXPR_CXX20 void test(S s, SV sv, typename S::size_type pos, typename S::size_type n, S expected) {
@@ -85,6 +86,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   {
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/initializer_list.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/initializer_list.pass.cpp
index ba55f30785e94f4..1054e6bfc638212 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/initializer_list.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/initializer_list.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test_string() {
@@ -27,9 +28,8 @@ TEST_CONSTEXPR_CXX20 void test_string() {
 
 TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
-#if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
-#endif
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 
   return true;
 }
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/iterator.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/iterator.pass.cpp
index b2ca4fb5ddd9370..bd5e126e69e7fa0 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/iterator.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/iterator.pass.cpp
@@ -17,6 +17,7 @@
 #include "test_macros.h"
 #include "test_iterators.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class It>
 TEST_CONSTEXPR_CXX20 void test(S s, It first, It last, S expected) {
@@ -170,7 +171,8 @@ TEST_CONSTEXPR_CXX20 void test_string() {
 TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
-  test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/pointer.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/pointer.pass.cpp
index 11e12c318a2e800..c00bdbff26f622d 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/pointer.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/pointer.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s, const typename S::value_type* str, S expected) {
@@ -43,6 +44,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   { // test assignment to self
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/pointer_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/pointer_size.pass.cpp
index 2738a9a6ffad594..c1e1951da2885d9 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/pointer_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/pointer_size.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s, const typename S::value_type* str, typename S::size_type n, S expected) {
@@ -48,6 +49,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   { // test assign to self
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/rv_string.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/rv_string.pass.cpp
index a33e8e97157c40b..cf87524b0d9fd13 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/rv_string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/rv_string.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s, S str, S expected) {
@@ -52,6 +53,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/size_char.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/size_char.pass.cpp
index b52c66103395f19..a2239dcd12d4a37 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/size_char.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/size_char.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s, typename S::size_type n, typename S::value_type c, S expected) {
@@ -44,6 +45,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/string.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/string.pass.cpp
index f39b7f66c4b187a..e08518297585117 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/string.pass.cpp
@@ -104,6 +104,14 @@ TEST_CONSTEXPR_CXX20 bool test() {
     testAlloc(S(), S("1234567890"), min_allocator<char>());
     testAlloc(S(), S("12345678901234567890"), min_allocator<char>());
   }
+  {
+    typedef std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>> S;
+    test_assign<S>();
+    testAlloc(S(), S(), fancy_pointer_allocator<char>());
+    testAlloc(S(), S("12345"), fancy_pointer_allocator<char>());
+    testAlloc(S(), S("1234567890"), fancy_pointer_allocator<char>());
+    testAlloc(S(), S("12345678901234567890"), fancy_pointer_allocator<char>());
+  }
 #endif
 #if TEST_STD_VER > 14
   {
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/string_size_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/string_size_size.pass.cpp
index 9448452bafad9c3..89250ce583d5dbd 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/string_size_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/string_size_size.pass.cpp
@@ -18,6 +18,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s, S str, typename S::size_type pos, typename S::size_type n, S expected) {
@@ -85,6 +86,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   {
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/string_view.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/string_view.pass.cpp
index aeda9db36a840ed..3ff71a929ba6def 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/string_view.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_assign/string_view.pass.cpp
@@ -69,6 +69,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_copy/copy.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_copy/copy.pass.cpp
index e1904baeb9033b0..a9683059e47a183 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_copy/copy.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_copy/copy.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S str, typename S::value_type* s, typename S::size_type n, typename S::size_type pos) {
@@ -108,6 +109,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_erase/iter.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_erase/iter.pass.cpp
index 03c5b965537c6fe..fd64a337ffb41fe 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_erase/iter.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_erase/iter.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s, typename S::difference_type pos, S expected) {
@@ -46,6 +47,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_erase/iter_iter.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_erase/iter_iter.pass.cpp
index f092ad718cdaa89..a0938b7166e56f2 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_erase/iter_iter.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_erase/iter_iter.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s, typename S::difference_type pos, typename S::difference_type n, S expected) {
@@ -89,6 +90,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_erase/pop_back.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_erase/pop_back.pass.cpp
index 9c63fa47a7e4a7f..5c4878f2db6f4ca 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_erase/pop_back.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_erase/pop_back.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s, S expected) {
@@ -35,6 +36,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_erase/size_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_erase/size_size.pass.cpp
index 610256061a5f2cd..296339d26b5d082 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_erase/size_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_erase/size_size.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s, typename S::size_type pos, typename S::size_type n, S expected) {
@@ -180,6 +181,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/iter_char.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/iter_char.pass.cpp
index bc3ce511ab5c221..664b30c78685492 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/iter_char.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/iter_char.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S& s, typename S::const_iterator p, typename S::value_type c, S expected) {
@@ -53,6 +54,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/iter_initializer_list.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/iter_initializer_list.pass.cpp
index 876cc9ecd14c6a8..65db9c673af8f79 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/iter_initializer_list.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/iter_initializer_list.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test_string() {
@@ -29,6 +30,7 @@ TEST_CONSTEXPR_CXX20 void test_string() {
 TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 
   return true;
 }
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/iter_iter_iter.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/iter_iter_iter.pass.cpp
index e3d0f1322e85de2..0d1720c218b7c77 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/iter_iter_iter.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/iter_iter_iter.pass.cpp
@@ -17,6 +17,7 @@
 #include "test_macros.h"
 #include "test_iterators.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class It>
 TEST_CONSTEXPR_CXX20 void test(S s, typename S::difference_type pos, It first, It last, S expected) {
@@ -147,6 +148,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
 #ifndef TEST_HAS_NO_EXCEPTIONS
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/iter_size_char.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/iter_size_char.pass.cpp
index 1e0d16e4cc2e172..0d4ac24631e4074 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/iter_size_char.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/iter_size_char.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -98,6 +99,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/size_T_size_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/size_T_size_size.pass.cpp
index f7e6ca71180e330..b0a19f977d4d594 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/size_T_size_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/size_T_size_size.pass.cpp
@@ -19,6 +19,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class SV>
 TEST_CONSTEXPR_CXX20 void
@@ -1858,6 +1859,8 @@ int main(int, char**) {
 #if TEST_STD_VER >= 11
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char>>,
        std::basic_string_view<char, std::char_traits<char>>>();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>,
+       std::basic_string_view<char, std::char_traits<char>>>();
 #endif
 
   return 0;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/size_pointer.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/size_pointer.pass.cpp
index 359fd999598f889..4c55bd10f6339b0 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/size_pointer.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/size_pointer.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s, typename S::size_type pos, const typename S::value_type* str, S expected) {
@@ -128,6 +129,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   { // test inserting into self
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/size_pointer_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/size_pointer_size.pass.cpp
index 44f20ff63cc0ca5..2c89f2e3a7875c0 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/size_pointer_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/size_pointer_size.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -388,11 +389,13 @@ int main(int, char**) {
   test<std::string>();
 #if TEST_STD_VER >= 11
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
 #if TEST_STD_VER > 17
   static_assert(test<std::string>());
   static_assert(test<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>());
+  static_assert(test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>());
 #endif
 
   return 0;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/size_size_char.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/size_size_char.pass.cpp
index 2396b7e2f54df73..a974d251e81d6ed 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/size_size_char.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/size_size_char.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -129,6 +130,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/size_string.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/size_string.pass.cpp
index 1b908ac464c3134..053c52c7fdcd6ab 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/size_string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/size_string.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s, typename S::size_type pos, S str, S expected) {
@@ -128,6 +129,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
 #if TEST_STD_VER >= 11
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/size_string_size_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/size_string_size_size.pass.cpp
index 1a8f6b35b42c445..e04972512cae659 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/size_string_size_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/size_string_size_size.pass.cpp
@@ -19,6 +19,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -1816,6 +1817,7 @@ int main(int, char**) {
   test<std::string>();
 #if TEST_STD_VER >= 11
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return 0;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/string_view.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/string_view.pass.cpp
index 7c0f157bc323009..699b88bec5813f9 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/string_view.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_insert/string_view.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class SV>
 TEST_CONSTEXPR_CXX20 void test(S s, typename S::size_type pos, SV sv, S expected) {
@@ -129,6 +130,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   { // test inserting into self
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/char.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/char.pass.cpp
index 1e03d8c1b614741..7b27a5d7b33a9df 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/char.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/char.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s, typename S::value_type str, S expected) {
@@ -35,6 +36,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/initializer_list.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/initializer_list.pass.cpp
index e7334b96276a5f8..db88d01cee3f480 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/initializer_list.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/initializer_list.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test_string() {
@@ -28,6 +29,7 @@ TEST_CONSTEXPR_CXX20 void test_string() {
 TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
   return true;
 }
 
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/pointer.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/pointer.pass.cpp
index 2d8c535b354c22f..ccc5fc708e013b0 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/pointer.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/pointer.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s, const typename S::value_type* str, S expected) {
@@ -50,6 +51,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/string.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/string.pass.cpp
index e02ced737ae16a2..4c0ca35f5f69a5e 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_op_plus_equal/string.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s, S str, S expected) {
@@ -51,6 +52,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
   { // LWG 2946
     std::string s;
     s += {"abc", 1};
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_initializer_list.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_initializer_list.pass.cpp
index efc21725ee24cde..41210a319bd3b0d 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_initializer_list.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_initializer_list.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test_string() {
@@ -28,6 +29,7 @@ TEST_CONSTEXPR_CXX20 void test_string() {
 TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 
   return true;
 }
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_iter_iter.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_iter_iter.pass.cpp
index c1ca532a5f910f9..3a2f12d31b162d4 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_iter_iter.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_iter_iter.pass.cpp
@@ -19,6 +19,7 @@
 #include "test_macros.h"
 #include "min_allocator.h"
 #include "test_iterators.h"
+#include "test_allocator.h"
 
 template <class S, class It>
 TEST_CONSTEXPR_CXX20 void test(S s, typename S::size_type pos1, typename S::size_type n1, It f, It l, S expected) {
@@ -1064,6 +1065,7 @@ int main(int, char**) {
   test<std::string>();
 #if TEST_STD_VER >= 11
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return 0;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_pointer.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_pointer.pass.cpp
index fa13ca8062b2a32..a7793fae3763bba 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_pointer.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_pointer.pass.cpp
@@ -19,6 +19,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -299,6 +300,7 @@ int main(int, char**) {
   test<std::string>();
 #if TEST_STD_VER >= 11
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return 0;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_pointer_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_pointer_size.pass.cpp
index 45d57c793a3352f..2ddf6ffe55be9b5 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_pointer_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_pointer_size.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -1004,6 +1005,7 @@ int main(int, char**) {
   test<std::string>();
 #if TEST_STD_VER >= 11
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return 0;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_size_char.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_size_char.pass.cpp
index dd87da1e2535463..4cd17627be91cb5 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_size_char.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_size_char.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -285,7 +286,8 @@ int main(int, char**) {
   test<std::string>();
 #if TEST_STD_VER >= 11
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return 0;
-}
+}
\ No newline at end of file
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_string.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_string.pass.cpp
index 35db1d636819169..b08a1eb9ba8604e 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_string.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s, typename S::size_type pos1, typename S::size_type n1, S str, S expected) {
@@ -292,6 +293,7 @@ int main(int, char**) {
   test<std::string>();
 #if TEST_STD_VER >= 11
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return 0;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_string_view.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_string_view.pass.cpp
index 767ed41ae22477b..d741aa0c0062cfb 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_string_view.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/iter_iter_string_view.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class SV>
 TEST_CONSTEXPR_CXX20 void test(S s, typename S::size_type pos1, typename S::size_type n1, SV sv, S expected) {
@@ -283,6 +284,7 @@ int main(int, char**) {
   test<char, std::allocator>();
 #if TEST_STD_VER >= 11
   test<char, min_allocator>();
+  test<char, fancy_pointer_allocator>();
 #endif
 
   return 0;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_T_size_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_T_size_size.pass.cpp
index 004a51926285394..3de486af2649b39 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_T_size_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_T_size_size.pass.cpp
@@ -23,6 +23,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class SV>
 TEST_CONSTEXPR_CXX20 void
@@ -6279,6 +6280,7 @@ int main(int, char**) {
   test<char, std::allocator>();
 #if TEST_STD_VER >= 11
   test<char, min_allocator>();
+  test<char, fancy_pointer_allocator>();
 #endif
 
   return 0;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_pointer.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_pointer.pass.cpp
index a7282615e485541..95a041bba16e051 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_pointer.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_pointer.pass.cpp
@@ -18,6 +18,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -377,6 +378,7 @@ int main(int, char**) {
   test<std::string>();
 #if TEST_STD_VER >= 11
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return 0;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_pointer_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_pointer_size.pass.cpp
index 7ef63bdf313ddaf..94e0bea469a0019 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_pointer_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_pointer_size.pass.cpp
@@ -18,6 +18,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -1341,6 +1342,7 @@ int main(int, char**) {
   test<std::string>();
 #if TEST_STD_VER >= 11
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return 0;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_size_char.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_size_char.pass.cpp
index 8841318c1d4df5b..a615b12421ca592 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_size_char.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_size_char.pass.cpp
@@ -18,6 +18,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -381,6 +382,7 @@ int main(int, char**) {
   test<std::string>();
 #if TEST_STD_VER >= 11
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return 0;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_string.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_string.pass.cpp
index fab2beeabd5721a..5b83b2388f30d81 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_string.pass.cpp
@@ -18,6 +18,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s, typename S::size_type pos1, typename S::size_type n1, S str, S expected) {
@@ -385,6 +386,7 @@ int main(int, char**) {
   test<std::string>();
 #if TEST_STD_VER >= 11
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
   return 0;
 }
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_string_size_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_string_size_size.pass.cpp
index 073de60289857ae..7212eb0810c79b9 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_string_size_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_string_size_size.pass.cpp
@@ -22,6 +22,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -6099,6 +6100,7 @@ int main(int, char**) {
   test<std::string>();
 #if TEST_STD_VER >= 11
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return 0;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_string_view.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_string_view.pass.cpp
index cec8cc0c52dd9f3..86bea46b917775d 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_string_view.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_replace/size_size_string_view.pass.cpp
@@ -18,6 +18,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class SV>
 TEST_CONSTEXPR_CXX20 void test(S s, typename S::size_type pos1, typename S::size_type n1, SV sv, S expected) {
@@ -376,6 +377,7 @@ int main(int, char**) {
   test<char, std::allocator>();
 #if TEST_STD_VER >= 11
   test<char, min_allocator>();
+  test<char, fancy_pointer_allocator>();
 #endif
 
   return 0;
diff --git a/libcxx/test/std/strings/basic.string/string.modifiers/string_swap/swap.pass.cpp b/libcxx/test/std/strings/basic.string/string.modifiers/string_swap/swap.pass.cpp
index 3d9ec016bcfbd3a..753707d7c6ebb7a 100644
--- a/libcxx/test/std/strings/basic.string/string.modifiers/string_swap/swap.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.modifiers/string_swap/swap.pass.cpp
@@ -14,6 +14,7 @@
 #include <stdexcept>
 #include <algorithm>
 #include <cassert>
+#include "test_allocator.h"
 
 #include "test_macros.h"
 #include "min_allocator.h"
@@ -53,6 +54,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string.io/get_line.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string.io/get_line.pass.cpp
index 7bcb34135440bfb..45a5e3d92485495 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string.io/get_line.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string.io/get_line.pass.cpp
@@ -19,6 +19,7 @@
 
 #include "min_allocator.h"
 #include "test_macros.h"
+#include "test_allocator.h"
 
 template <template <class> class Alloc>
 void test_string() {
@@ -144,6 +145,7 @@ int main(int, char**) {
   test_string<std::allocator>();
 #if TEST_STD_VER >= 11
   test_string<min_allocator>();
+  test_string<fancy_pointer_allocator>();
 #endif
 
   return 0;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string.io/get_line_delim.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string.io/get_line_delim.pass.cpp
index 97a55fa09d14df0..87962e85cdf1ce4 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string.io/get_line_delim.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string.io/get_line_delim.pass.cpp
@@ -19,6 +19,7 @@
 
 #include "min_allocator.h"
 #include "test_macros.h"
+#include "test_allocator.h"
 
 template <template <class> class Alloc>
 void test_string() {
@@ -150,6 +151,7 @@ int main(int, char**) {
   test_string<std::allocator>();
 #if TEST_STD_VER >= 11
   test_string<min_allocator>();
+  test_string<fancy_pointer_allocator>();
 #endif
   return 0;
 }
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string.io/get_line_delim_rv.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string.io/get_line_delim_rv.pass.cpp
index 1cd50a4c8940c75..275274606e60e21 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string.io/get_line_delim_rv.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string.io/get_line_delim_rv.pass.cpp
@@ -19,6 +19,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <template <class> class Alloc>
 void test() {
@@ -42,6 +43,7 @@ int main(int, char**) {
   test<std::allocator>();
 #if TEST_STD_VER >= 11
   test<min_allocator>();
+  test<fancy_pointer_allocator>();
 #endif
 
   return 0;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string.io/get_line_rv.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string.io/get_line_rv.pass.cpp
index ff100f9234bef0e..dac37ff415388a9 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string.io/get_line_rv.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string.io/get_line_rv.pass.cpp
@@ -19,6 +19,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <template <class> class Alloc>
 void test() {
@@ -41,6 +42,9 @@ void test() {
 int main(int, char**) {
   test<std::allocator>();
   test<min_allocator>();
+#if TEST_STD_VER >= 11
+  test<fancy_pointer_allocator>();
+#endif // TEST_STD_VER >= 11
 
   return 0;
 }
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string.io/stream_extract.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string.io/stream_extract.pass.cpp
index fde4990c9cafb24..e04f11b11501528 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string.io/stream_extract.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string.io/stream_extract.pass.cpp
@@ -19,6 +19,7 @@
 
 #include "min_allocator.h"
 #include "test_macros.h"
+#include "test_allocator.h"
 
 template <template <class> class Alloc>
 void test_string() {
@@ -115,6 +116,7 @@ int main(int, char**) {
   test_string<std::allocator>();
 #if TEST_STD_VER >= 11
   test_string<min_allocator>();
+  test_string<fancy_pointer_allocator>();
 #endif
 
   return 0;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string.io/stream_insert.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string.io/stream_insert.pass.cpp
index c66f15213ff2f03..89b46d41a5e7af4 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string.io/stream_insert.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string.io/stream_insert.pass.cpp
@@ -19,6 +19,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <template <class> class Alloc>
 void test() {
@@ -65,6 +66,7 @@ int main(int, char**) {
 
 #if TEST_STD_VER >= 11
   test<min_allocator>();
+  test<fancy_pointer_allocator>();
 #endif
 
   return 0;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string.special/swap.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string.special/swap.pass.cpp
index da6fc11c14329f4..54f078f36dcb226 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string.special/swap.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string.special/swap.pass.cpp
@@ -19,6 +19,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(S s1, S s2) {
@@ -55,6 +56,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_op!=/pointer_string.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_op!=/pointer_string.pass.cpp
index 11cfcfcf4299570..bd77ce2e59ea734 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_op!=/pointer_string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_op!=/pointer_string.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const typename S::value_type* lhs, const S& rhs, bool x) {
@@ -46,6 +47,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_op!=/string_pointer.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_op!=/string_pointer.pass.cpp
index c04c06243cd258b..c7429e8cc1c7027 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_op!=/string_pointer.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_op!=/string_pointer.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const S& lhs, const typename S::value_type* rhs, bool x) {
@@ -46,6 +47,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_op!=/string_string.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_op!=/string_string.pass.cpp
index 881770e421bb04c..5081cc6958257de 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_op!=/string_string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_op!=/string_string.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const S& lhs, const S& rhs, bool x) {
@@ -47,6 +48,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_op!=/string_string_view.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_op!=/string_string_view.pass.cpp
index 1595ec501f4e90c..da6a3c86fbb4e7f 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_op!=/string_string_view.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_op!=/string_string_view.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class SV>
 TEST_CONSTEXPR_CXX20 void test(const S& lhs, SV rhs, bool x) {
@@ -46,6 +47,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_op!=/string_view_string.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_op!=/string_view_string.pass.cpp
index 246b98bc5e107cf..35bd322002cdc5f 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_op!=/string_view_string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_op!=/string_view_string.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class SV>
 TEST_CONSTEXPR_CXX20 void test(SV lhs, const S& rhs, bool x) {
@@ -46,6 +47,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_op+/char_string.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_op+/char_string.pass.cpp
index 82a591e0533628d..2a871048971fc20 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_op+/char_string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_op+/char_string.pass.cpp
@@ -22,6 +22,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test0(typename S::value_type lhs, const S& rhs, const S& x) {
@@ -53,6 +54,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_op+/pointer_string.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_op+/pointer_string.pass.cpp
index fa14f657d8269c3..772fefcef421247 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_op+/pointer_string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_op+/pointer_string.pass.cpp
@@ -22,6 +22,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test0(const typename S::value_type* lhs, const S& rhs, const S& x) {
@@ -78,6 +79,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_op+/string_char.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_op+/string_char.pass.cpp
index 66cbac28f9f2c3a..aa139a3635285d6 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_op+/string_char.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_op+/string_char.pass.cpp
@@ -22,6 +22,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test0(const S& lhs, typename S::value_type rhs, const S& x) {
@@ -55,6 +56,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_op+/string_pointer.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_op+/string_pointer.pass.cpp
index 2802189f843c59c..08de53089d14dae 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_op+/string_pointer.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_op+/string_pointer.pass.cpp
@@ -22,6 +22,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test0(const S& lhs, const typename S::value_type* rhs, const S& x) {
@@ -77,6 +78,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_op+/string_string.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_op+/string_string.pass.cpp
index f8ebb98767a8375..51c12e5dec300f0 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_op+/string_string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_op+/string_string.pass.cpp
@@ -34,6 +34,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test0(const S& lhs, const S& rhs, const S& x) {
@@ -133,6 +134,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_operator==/pointer_string.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_operator==/pointer_string.pass.cpp
index a8114af2600cad2..e32beb04f45dee2 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_operator==/pointer_string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_operator==/pointer_string.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const typename S::value_type* lhs, const S& rhs, bool x) {
@@ -46,6 +47,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_operator==/string_pointer.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_operator==/string_pointer.pass.cpp
index 8e67e6e81a6e91d..b5c4417fc7a82cc 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_operator==/string_pointer.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_operator==/string_pointer.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const S& lhs, const typename S::value_type* rhs, bool x) {
@@ -46,6 +47,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_operator==/string_string.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_operator==/string_string.pass.cpp
index 31bace312f1df8d..6f08981e51f5fac 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_operator==/string_string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_operator==/string_string.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const S& lhs, const S& rhs, bool x) {
@@ -47,6 +48,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_operator==/string_string_view.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_operator==/string_string_view.pass.cpp
index c758c4adfe60428..9cd603eaa60071d 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_operator==/string_string_view.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_operator==/string_string_view.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class SV>
 TEST_CONSTEXPR_CXX20 void test(const S& lhs, SV rhs, bool x) {
@@ -47,6 +48,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<char, std::allocator>();
 #if TEST_STD_VER >= 11
   test_string<char, min_allocator>();
+  test_string<char, fancy_pointer_allocator>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_operator==/string_view_string.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_operator==/string_view_string.pass.cpp
index 39dd627033c4856..86615394ce32ab5 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_operator==/string_view_string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_operator==/string_view_string.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class SV>
 TEST_CONSTEXPR_CXX20 void test(SV lhs, const S& rhs, bool x) {
@@ -48,6 +49,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<char, std::allocator>();
 #if TEST_STD_VER >= 11
   test_string<char, min_allocator>();
+  test_string<char, fancy_pointer_allocator>();
 #endif
   return true;
 }
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt/pointer_string.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt/pointer_string.pass.cpp
index ce0fbf55b5c5111..8fb70310cb3f154 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt/pointer_string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt/pointer_string.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const typename S::value_type* lhs, const S& rhs, bool x) {
@@ -46,6 +47,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt/string_pointer.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt/string_pointer.pass.cpp
index 2a77947bc7febea..79468cf9ac5a40f 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt/string_pointer.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt/string_pointer.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const S& lhs, const typename S::value_type* rhs, bool x) {
@@ -46,6 +47,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt/string_string.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt/string_string.pass.cpp
index 794f9e76b4e857e..b799d1773a8ac87 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt/string_string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt/string_string.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const S& lhs, const S& rhs, bool x) {
@@ -47,6 +48,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt/string_string_view.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt/string_string_view.pass.cpp
index de06981bb47870a..43926e53404f87c 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt/string_string_view.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt/string_string_view.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class SV>
 TEST_CONSTEXPR_CXX20 void test(const S& lhs, SV rhs, bool x) {
@@ -47,6 +48,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<char, std::allocator>();
 #if TEST_STD_VER >= 11
   test_string<char, min_allocator>();
+  test_string<char, fancy_pointer_allocator>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt/string_view_string.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt/string_view_string.pass.cpp
index 8026777a88db195..c5525240e63eb30 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt/string_view_string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt/string_view_string.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class SV>
 TEST_CONSTEXPR_CXX20 void test(SV lhs, const S& rhs, bool x) {
@@ -47,6 +48,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<char, std::allocator>();
 #if TEST_STD_VER >= 11
   test_string<char, min_allocator>();
+  test_string<char, fancy_pointer_allocator>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt=/pointer_string.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt=/pointer_string.pass.cpp
index 35d3c69785325a3..0774e120e4f94e6 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt=/pointer_string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt=/pointer_string.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const typename S::value_type* lhs, const S& rhs, bool x) {
@@ -46,6 +47,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_pointer.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_pointer.pass.cpp
index 3f8883e358da56e..50279392b934d51 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_pointer.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_pointer.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const S& lhs, const typename S::value_type* rhs, bool x) {
@@ -46,6 +47,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_string.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_string.pass.cpp
index 1dc65bf0b6db093..af17ea82748d98d 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_string.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const S& lhs, const S& rhs, bool x) {
@@ -47,6 +48,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_string_view.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_string_view.pass.cpp
index 19c96ffb77e79da..54fb2f9b174d227 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_string_view.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_string_view.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class SV>
 TEST_CONSTEXPR_CXX20 void test(const S& lhs, SV rhs, bool x) {
@@ -47,6 +48,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<char, std::allocator>();
 #if TEST_STD_VER >= 11
   test_string<char, min_allocator>();
+  test_string<char, fancy_pointer_allocator>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_view_string.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_view_string.pass.cpp
index d55b2f8fd34be45..c70a90ac4de4741 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_view_string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_opgt=/string_view_string.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class SV>
 TEST_CONSTEXPR_CXX20 void test(SV lhs, const S& rhs, bool x) {
@@ -47,6 +48,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<char, std::allocator>();
 #if TEST_STD_VER >= 11
   test_string<char, min_allocator>();
+  test_string<char, fancy_pointer_allocator>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt/pointer_string.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt/pointer_string.pass.cpp
index 0c4dbe2f9193b96..abeebad52977b1c 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt/pointer_string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt/pointer_string.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const typename S::value_type* lhs, const S& rhs, bool x) {
@@ -46,6 +47,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt/string_pointer.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt/string_pointer.pass.cpp
index bcdb1091140dfc6..b0a7c29cd8bdae2 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt/string_pointer.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt/string_pointer.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const S& lhs, const typename S::value_type* rhs, bool x) {
@@ -46,6 +47,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt/string_string.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt/string_string.pass.cpp
index 6ca1dd27f31ab6f..4f835fdeef2a7b1 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt/string_string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt/string_string.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const S& lhs, const S& rhs, bool x) {
@@ -47,6 +48,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt/string_string_view.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt/string_string_view.pass.cpp
index 56549d17677364e..4d39b0baf1b2b7d 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt/string_string_view.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt/string_string_view.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class SV>
 TEST_CONSTEXPR_CXX20 void test(const S& lhs, SV rhs, bool x) {
@@ -47,6 +48,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<char, std::allocator>();
 #if TEST_STD_VER >= 11
   test_string<char, min_allocator>();
+  test_string<char, fancy_pointer_allocator>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt/string_view_string.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt/string_view_string.pass.cpp
index 72e9d4bf96682a9..9c8503bd2b93423 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt/string_view_string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt/string_view_string.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class SV>
 TEST_CONSTEXPR_CXX20 void test(SV lhs, const S& rhs, bool x) {
@@ -47,6 +48,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<char, std::allocator>();
 #if TEST_STD_VER >= 11
   test_string<char, min_allocator>();
+  test_string<char, fancy_pointer_allocator>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt=/pointer_string.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt=/pointer_string.pass.cpp
index 85c6f04ecc2c146..03679cc700f9f51 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt=/pointer_string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt=/pointer_string.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const typename S::value_type* lhs, const S& rhs, bool x) {
@@ -46,6 +47,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_pointer.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_pointer.pass.cpp
index 16db9337823297b..1689f13dc46d59d 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_pointer.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_pointer.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const S& lhs, const typename S::value_type* rhs, bool x) {
@@ -46,6 +47,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_string.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_string.pass.cpp
index a97001417791564..33c6a1e2f3276bd 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_string.pass.cpp
@@ -17,6 +17,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const S& lhs, const S& rhs, bool x) {
@@ -47,6 +48,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_string_view.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_string_view.pass.cpp
index 2ee253820c11e95..24db2ba6c75d14f 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_string_view.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_string_view.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class SV>
 TEST_CONSTEXPR_CXX20 void test(const S& lhs, SV rhs, bool x) {
@@ -47,6 +48,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<char, std::allocator>();
 #if TEST_STD_VER >= 11
   test_string<char, min_allocator>();
+  test_string<char, fancy_pointer_allocator>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_view_string.pass.cpp b/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_view_string.pass.cpp
index 88951e4da9101bf..a9b74e72c222fe0 100644
--- a/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_view_string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.nonmembers/string_oplt=/string_view_string.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class SV>
 TEST_CONSTEXPR_CXX20 void test(SV lhs, const S& rhs, bool x) {
@@ -47,6 +48,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<char, std::allocator>();
 #if TEST_STD_VER >= 11
   test_string<char, min_allocator>();
+  test_string<char, fancy_pointer_allocator>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string.accessors/c_str.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string.accessors/c_str.pass.cpp
index 837599ae9ef551b..a7053de9512df53 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string.accessors/c_str.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string.accessors/c_str.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const S& s) {
@@ -39,6 +40,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string.accessors/data.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string.accessors/data.pass.cpp
index 27762fbd9390d51..d03f03e05fbd5c7 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string.accessors/data.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string.accessors/data.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test_const(const S& s) {
@@ -63,6 +64,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string.accessors/get_allocator.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string.accessors/get_allocator.pass.cpp
index a6158aeb38dc2e8..1d552345f06aba3 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string.accessors/get_allocator.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string.accessors/get_allocator.pass.cpp
@@ -39,6 +39,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string(test_allocator<char>(3));
 #if TEST_STD_VER >= 11
   test_string(min_allocator<char>());
+  test_string(fancy_pointer_allocator<char>());
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_compare/pointer.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_compare/pointer.pass.cpp
index e1d23924517ffbf..edf335538910ac4 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_compare/pointer.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_compare/pointer.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 TEST_CONSTEXPR_CXX20 int sign(int x) {
   if (x == 0)
@@ -54,6 +55,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_T_size_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_T_size_size.pass.cpp
index c6281d9e377f474..b073873baf27728 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_T_size_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_T_size_size.pass.cpp
@@ -19,6 +19,7 @@
 #include <cassert>
 
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 #include "test_macros.h"
 
@@ -6044,6 +6045,7 @@ int main(int, char**) {
   test<char, std::allocator>();
 #if TEST_STD_VER >= 11
   test<char, min_allocator>();
+  test<char, fancy_pointer_allocator>();
 #endif
 
   return 0;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_pointer.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_pointer.pass.cpp
index d4a5133ed3907f8..2f44efa443aed54 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_pointer.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_pointer.pass.cpp
@@ -15,6 +15,7 @@
 #include <cassert>
 
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 #include "test_macros.h"
 
@@ -362,6 +363,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_pointer_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_pointer_size.pass.cpp
index aba230d92e18248..c9979cf1dbb7f4f 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_pointer_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_pointer_size.pass.cpp
@@ -15,6 +15,7 @@
 #include <cassert>
 
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 #include "test_macros.h"
 
@@ -1339,6 +1340,7 @@ int main(int, char**) {
   test<std::string>();
 #if TEST_STD_VER >= 11
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return 0;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_string.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_string.pass.cpp
index 018daaa2f262e4f..597528472b33e5e 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_string.pass.cpp
@@ -16,6 +16,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 TEST_CONSTEXPR_CXX20 int sign(int x) {
   if (x == 0)
@@ -369,6 +370,7 @@ int main(int, char**) {
   test<std::string>();
 #if TEST_STD_VER >= 11
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
   { // LWG 2946
     std::string s = " !";
     assert(s.compare(0, 1, {"abc", 1}) < 0);
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_string_size_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_string_size_size.pass.cpp
index f5d70b93c979f94..35e4be5e3d5ee5d 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_string_size_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_string_size_size.pass.cpp
@@ -19,6 +19,7 @@
 #include <cassert>
 
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 #include "test_macros.h"
 
@@ -6010,6 +6011,7 @@ int main(int, char**) {
   test<std::string>();
 #if TEST_STD_VER >= 11
   test<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return 0;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_string_view.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_string_view.pass.cpp
index 006f8495886b83a..2ed2c7b11fb576b 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_string_view.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_compare/size_size_string_view.pass.cpp
@@ -15,6 +15,7 @@
 #include <cassert>
 
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 #include "test_macros.h"
 
@@ -364,6 +365,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<char, std::allocator>();
 #if TEST_STD_VER >= 11
   test_string<char, min_allocator>();
+  test_string<char, fancy_pointer_allocator>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_compare/string.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_compare/string.pass.cpp
index 7378b604c91c87e..2f2fa2679b6531f 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_compare/string.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_compare/string.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 TEST_CONSTEXPR_CXX20 int sign(int x) {
   if (x == 0)
@@ -54,6 +55,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
   { // LWG 2946
     std::string s = " !";
     assert(s.compare({"abc", 1}) < 0);
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_compare/string_view.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_compare/string_view.pass.cpp
index a03e34328f51a59..6cfa314397e5f1b 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_compare/string_view.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_compare/string_view.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 TEST_CONSTEXPR_CXX20 int sign(int x) {
   if (x == 0)
@@ -57,6 +58,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<char, std::allocator>();
 #if TEST_STD_VER >= 11
   test_string<char, min_allocator>();
+  test_string<char, fancy_pointer_allocator>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_find.first.not.of/char_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_find.first.not.of/char_size.pass.cpp
index fd97e5bd6e79c02..967f337703bbf79 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_find.first.not.of/char_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_find.first.not.of/char_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -68,6 +69,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_find.first.not.of/pointer_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_find.first.not.of/pointer_size.pass.cpp
index 927ec97ae0218f3..b7b3a627ddf1202 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_find.first.not.of/pointer_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_find.first.not.of/pointer_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -146,6 +147,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_find.first.not.of/pointer_size_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_find.first.not.of/pointer_size_size.pass.cpp
index 2da628b8437d5c3..d66a031744d6040 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_find.first.not.of/pointer_size_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_find.first.not.of/pointer_size_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -377,6 +378,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_find.first.not.of/string_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_find.first.not.of/string_size.pass.cpp
index 23e1906943401b6..de712424a77c673 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_find.first.not.of/string_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_find.first.not.of/string_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const S& s, const S& str, typename S::size_type pos, typename S::size_type x) {
@@ -146,6 +147,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
   { // LWG 2946
     std::string s = " !";
     assert(s.find_first_not_of({"abc", 1}) == 0);
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_find.first.not.of/string_view_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_find.first.not.of/string_view_size.pass.cpp
index d63eb8c2f1673ff..d906496b73da4b5 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_find.first.not.of/string_view_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_find.first.not.of/string_view_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class SV>
 TEST_CONSTEXPR_CXX20 void test(const S& s, SV sv, typename S::size_type pos, typename S::size_type x) {
@@ -149,6 +150,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<char, std::allocator>();
 #if TEST_STD_VER >= 11
   test_string<char, min_allocator>();
+  test_string<char, fancy_pointer_allocator>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_find.first.of/char_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_find.first.of/char_size.pass.cpp
index 100d3f4bf25107d..aed0ff6feaea354 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_find.first.of/char_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_find.first.of/char_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -66,6 +67,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_find.first.of/pointer_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_find.first.of/pointer_size.pass.cpp
index 6d805393245e782..0977b40cb32fe16 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_find.first.of/pointer_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_find.first.of/pointer_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -147,6 +148,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_find.first.of/pointer_size_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_find.first.of/pointer_size_size.pass.cpp
index 14d23b8ece135e2..50f280ac10b0263 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_find.first.of/pointer_size_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_find.first.of/pointer_size_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -377,6 +378,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_find.first.of/string_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_find.first.of/string_size.pass.cpp
index ed872091dcffe9d..025b013843f6ebc 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_find.first.of/string_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_find.first.of/string_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const S& s, const S& str, typename S::size_type pos, typename S::size_type x) {
@@ -146,6 +147,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
   { // LWG 2946
     std::string s = " !";
     assert(s.find_first_of({"abc", 1}) == std::string::npos);
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_find.first.of/string_view_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_find.first.of/string_view_size.pass.cpp
index 541d0f171a91e57..fa75567950d1976 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_find.first.of/string_view_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_find.first.of/string_view_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class SV>
 TEST_CONSTEXPR_CXX20 void test(const S& s, SV sv, typename S::size_type pos, typename S::size_type x) {
@@ -149,6 +150,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<char, std::allocator>();
 #if TEST_STD_VER >= 11
   test_string<char, min_allocator>();
+  test_string<char, fancy_pointer_allocator>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_find.last.not.of/char_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_find.last.not.of/char_size.pass.cpp
index a23206d51430c07..e40ebd048711c92 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_find.last.not.of/char_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_find.last.not.of/char_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -66,6 +67,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_find.last.not.of/pointer_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_find.last.not.of/pointer_size.pass.cpp
index 1cb761ee31a641a..f9332fe48c779e6 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_find.last.not.of/pointer_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_find.last.not.of/pointer_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -147,6 +148,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_find.last.not.of/pointer_size_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_find.last.not.of/pointer_size_size.pass.cpp
index 4fe72a5a9e5c1a8..aef6f1ed647e62e 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_find.last.not.of/pointer_size_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_find.last.not.of/pointer_size_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -377,6 +378,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_find.last.not.of/string_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_find.last.not.of/string_size.pass.cpp
index ae088ba98b5ff5f..a200504d26eef1e 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_find.last.not.of/string_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_find.last.not.of/string_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const S& s, const S& str, typename S::size_type pos, typename S::size_type x) {
@@ -146,6 +147,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
   { // LWG 2946
     std::string s = " !";
     assert(s.find_last_not_of({"abc", 1}) == s.size() - 1);
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_find.last.not.of/string_view_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_find.last.not.of/string_view_size.pass.cpp
index 478015095a7accb..1bd55b1c51e03f4 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_find.last.not.of/string_view_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_find.last.not.of/string_view_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class SV>
 TEST_CONSTEXPR_CXX20 void test(const S& s, SV sv, typename S::size_type pos, typename S::size_type x) {
@@ -149,6 +150,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<char, std::allocator>();
 #if TEST_STD_VER >= 11
   test_string<char, min_allocator>();
+  test_string<char, fancy_pointer_allocator>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_find.last.of/char_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_find.last.of/char_size.pass.cpp
index fd278d9b917ebab..f91f642a125ab37 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_find.last.of/char_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_find.last.of/char_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -66,6 +67,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_find.last.of/pointer_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_find.last.of/pointer_size.pass.cpp
index f177671e8ebfe2c..8e6c3339b2a96e8 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_find.last.of/pointer_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_find.last.of/pointer_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -147,6 +148,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_find.last.of/pointer_size_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_find.last.of/pointer_size_size.pass.cpp
index 0dc4f92ba33b7b6..3d84112961ecb19 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_find.last.of/pointer_size_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_find.last.of/pointer_size_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -377,6 +378,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_find.last.of/string_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_find.last.of/string_size.pass.cpp
index c4c7c251445feb9..d5b86903532d6a5 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_find.last.of/string_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_find.last.of/string_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const S& s, const S& str, typename S::size_type pos, typename S::size_type x) {
@@ -146,6 +147,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
   { // LWG 2946
     std::string s = " !";
     assert(s.find_last_of({"abc", 1}) == std::string::npos);
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_find.last.of/string_view_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_find.last.of/string_view_size.pass.cpp
index 3eae90abd78fbda..b6362909a1e627f 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_find.last.of/string_view_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_find.last.of/string_view_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class SV>
 TEST_CONSTEXPR_CXX20 void test(const S& s, SV sv, typename S::size_type pos, typename S::size_type x) {
@@ -148,6 +149,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<char, std::allocator>();
 #if TEST_STD_VER >= 11
   test_string<char, min_allocator>();
+  test_string<char, fancy_pointer_allocator>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_find/char_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_find/char_size.pass.cpp
index c0c89c90b301919..8c4917aa18ee66d 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_find/char_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_find/char_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -66,6 +67,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_find/pointer_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_find/pointer_size.pass.cpp
index e07302f2624f4b7..b66472e2e9bf9de 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_find/pointer_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_find/pointer_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -151,6 +152,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_find/pointer_size_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_find/pointer_size_size.pass.cpp
index 5fda0e2af64c779..b420d4d4ab1f6d2 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_find/pointer_size_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_find/pointer_size_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -377,6 +378,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_find/string_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_find/string_size.pass.cpp
index 60ed469ce991b14..a469943372d3e97 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_find/string_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_find/string_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const S& s, const S& str, typename S::size_type pos, typename S::size_type x) {
@@ -146,6 +147,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 #if TEST_STD_VER >= 11
   { // LWG 2946
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_find/string_view_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_find/string_view_size.pass.cpp
index 68c08e2d504bd95..45080544c1a1e8f 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_find/string_view_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_find/string_view_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class SV>
 TEST_CONSTEXPR_CXX20 void test(const S& s, SV sv, typename S::size_type pos, typename S::size_type x) {
@@ -148,6 +149,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<char, std::allocator>();
 #if TEST_STD_VER >= 11
   test_string<char, min_allocator>();
+  test_string<char, fancy_pointer_allocator>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_rfind/char_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_rfind/char_size.pass.cpp
index b8f2ad0112d4ab6..94685a493279b2d 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_rfind/char_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_rfind/char_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -66,6 +67,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_rfind/pointer_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_rfind/pointer_size.pass.cpp
index 1d396fb6b8efeb3..3c86a6288b859d4 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_rfind/pointer_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_rfind/pointer_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -146,6 +147,7 @@ TEST_CONSTEXPR_CXX20 bool tests() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_rfind/pointer_size_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_rfind/pointer_size_size.pass.cpp
index 8e981a5e1087dd8..30c5e735e35491e 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_rfind/pointer_size_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_rfind/pointer_size_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void
@@ -377,6 +378,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_rfind/string_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_rfind/string_size.pass.cpp
index f9d09dcabcfd235..42333303177cd30 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_rfind/string_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_rfind/string_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S>
 TEST_CONSTEXPR_CXX20 void test(const S& s, const S& str, typename S::size_type pos, typename S::size_type x) {
@@ -140,6 +141,7 @@ TEST_CONSTEXPR_CXX20 bool tests() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
   { // LWG 2946
     std::string s = " !";
     assert(s.rfind({"abc", 1}) == std::string::npos);
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_rfind/string_view_size.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_rfind/string_view_size.pass.cpp
index e42fd3a0ee2de5d..0e23762c978c2c4 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_rfind/string_view_size.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_rfind/string_view_size.pass.cpp
@@ -15,6 +15,7 @@
 
 #include "test_macros.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class S, class SV>
 TEST_CONSTEXPR_CXX20 void test(const S& s, SV sv, typename S::size_type pos, typename S::size_type x) {
@@ -144,6 +145,7 @@ TEST_CONSTEXPR_CXX20 bool tests() {
   test_string<char, std::allocator>();
 #if TEST_STD_VER >= 11
   test_string<char, min_allocator>();
+  test_string<char, fancy_pointer_allocator>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_substr/substr.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_substr/substr.pass.cpp
index 83cfa8737408ca5..88ea53c038dc78f 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_substr/substr.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_substr/substr.pass.cpp
@@ -108,6 +108,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string<std::string>();
 #if TEST_STD_VER >= 11
   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.ops/string_substr/substr_rvalue.pass.cpp b/libcxx/test/std/strings/basic.string/string.ops/string_substr/substr_rvalue.pass.cpp
index c3c6c3f56b91961..1522feff5a2884d 100644
--- a/libcxx/test/std/strings/basic.string/string.ops/string_substr/substr_rvalue.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.ops/string_substr/substr_rvalue.pass.cpp
@@ -74,6 +74,7 @@ constexpr void test_allocators() {
   test_string<std::basic_string<CharT, CharTraits, std::allocator<CharT>>>();
   test_string<std::basic_string<CharT, CharTraits, min_allocator<CharT>>>();
   test_string<std::basic_string<CharT, CharTraits, test_allocator<CharT>>>();
+  test_string<std::basic_string<CharT, CharTraits, fancy_pointer_allocator<CharT>>>();
 }
 
 template <class CharT>
diff --git a/libcxx/test/std/strings/basic.string/string.require/contiguous.pass.cpp b/libcxx/test/std/strings/basic.string/string.require/contiguous.pass.cpp
index 78908901686cf30..51587e731d93725 100644
--- a/libcxx/test/std/strings/basic.string/string.require/contiguous.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.require/contiguous.pass.cpp
@@ -50,6 +50,7 @@ TEST_CONSTEXPR_CXX20 bool test() {
   test_string(test_allocator<char>(3));
 #if TEST_STD_VER >= 11
   test_string(min_allocator<char>());
+  test_string(fancy_pointer_allocator<char>());
 #endif
 
   return true;
diff --git a/libcxx/test/std/strings/basic.string/string.starts_with/starts_with.char.pass.cpp b/libcxx/test/std/strings/basic.string/string.starts_with/starts_with.char.pass.cpp
index eb9399d62eaa3b7..1a3b1f9d85acd06 100644
--- a/libcxx/test/std/strings/basic.string/string.starts_with/starts_with.char.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.starts_with/starts_with.char.pass.cpp
@@ -15,6 +15,7 @@
 #include <cassert>
 
 #include "test_macros.h"
+#include "test_allocator.h"
 
 template <class S>
 constexpr void test_string() {
@@ -31,6 +32,7 @@ constexpr void test_string() {
 
 constexpr bool test() {
   test_string<std::string>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 
   return true;
 }
diff --git a/libcxx/test/std/strings/basic.string/string.starts_with/starts_with.ptr.pass.cpp b/libcxx/test/std/strings/basic.string/string.starts_with/starts_with.ptr.pass.cpp
index 3647489a0f15f3e..25f0229f19b669b 100644
--- a/libcxx/test/std/strings/basic.string/string.starts_with/starts_with.ptr.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.starts_with/starts_with.ptr.pass.cpp
@@ -15,6 +15,7 @@
 #include <cassert>
 
 #include "test_macros.h"
+#include "test_allocator.h"
 
 template <class S>
 constexpr void test_string() {
@@ -59,6 +60,7 @@ constexpr void test_string() {
 
 constexpr bool test() {
   test_string<std::string>();
+  test_string<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char>>>();
 
   return true;
 }
diff --git a/libcxx/test/std/strings/basic.string/string.starts_with/starts_with.string_view.pass.cpp b/libcxx/test/std/strings/basic.string/string.starts_with/starts_with.string_view.pass.cpp
index c09afbae378498f..5e0806167d3c387 100644
--- a/libcxx/test/std/strings/basic.string/string.starts_with/starts_with.string_view.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.starts_with/starts_with.string_view.pass.cpp
@@ -15,6 +15,7 @@
 #include <cassert>
 
 #include "test_macros.h"
+#include "test_allocator.h"
 
 template <class CharT, template <class> class Alloc>
 constexpr void test_string() {
@@ -70,6 +71,7 @@ constexpr void test_string() {
 
 constexpr bool test() {
   test_string<char, std::allocator>();
+  test_string<char, fancy_pointer_allocator>();
 
   return true;
 }
diff --git a/libcxx/test/std/strings/basic.string/types.pass.cpp b/libcxx/test/std/strings/basic.string/types.pass.cpp
index 45408fa62029863..5d6ca300f45b231 100644
--- a/libcxx/test/std/strings/basic.string/types.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/types.pass.cpp
@@ -39,6 +39,7 @@
 #include "test_traits.h"
 #include "test_allocator.h"
 #include "min_allocator.h"
+#include "test_allocator.h"
 
 template <class Traits, class Allocator>
 void test() {
@@ -79,6 +80,7 @@ int main(int, char**) {
   static_assert((std::is_same<std::basic_string<char>::allocator_type, std::allocator<char> >::value), "");
 #if TEST_STD_VER >= 11
   test<std::char_traits<char>, min_allocator<char> >();
+  test<std::char_traits<char>, fancy_pointer_allocator<char> >();
 #endif
 
   return 0;
diff --git a/libcxx/test/std/strings/strings.erasure/erase.pass.cpp b/libcxx/test/std/strings/strings.erasure/erase.pass.cpp
index 35139dd6ad4076c..1d6f3bc5edeb205 100644
--- a/libcxx/test/std/strings/strings.erasure/erase.pass.cpp
+++ b/libcxx/test/std/strings/strings.erasure/erase.pass.cpp
@@ -66,8 +66,9 @@ void test() {
 
 int main(int, char**) {
   test<std::string>();
-  test<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
-  test<std::basic_string<char, std::char_traits<char>, test_allocator<char>>>();
+  test<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test<std::basic_string<char, std::char_traits<char>, test_allocator<char> > >();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 
   return 0;
 }
diff --git a/libcxx/test/std/strings/strings.erasure/erase_if.pass.cpp b/libcxx/test/std/strings/strings.erasure/erase_if.pass.cpp
index 5bedd394ee57811..f8a42310409e991 100644
--- a/libcxx/test/std/strings/strings.erasure/erase_if.pass.cpp
+++ b/libcxx/test/std/strings/strings.erasure/erase_if.pass.cpp
@@ -68,8 +68,9 @@ void test() {
 
 int main(int, char**) {
   test<std::string>();
-  test<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
-  test<std::basic_string<char, std::char_traits<char>, test_allocator<char>>>();
+  test<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
+  test<std::basic_string<char, std::char_traits<char>, test_allocator<char> > >();
+  test<std::basic_string<char, std::char_traits<char>, fancy_pointer_allocator<char> > >();
 
   return 0;
 }
diff --git a/libcxx/test/support/test_allocator.h b/libcxx/test/support/test_allocator.h
index 3bde73183ab6e39..9c0103665057bef 100644
--- a/libcxx/test/support/test_allocator.h
+++ b/libcxx/test/support/test_allocator.h
@@ -17,6 +17,7 @@
 #include <cstdlib>
 #include <climits>
 #include <cassert>
+#include <iterator>
 
 #include "test_macros.h"
 
@@ -29,8 +30,8 @@ TEST_CONSTEXPR_CXX20 inline typename std::allocator_traits<Alloc>::size_type all
 struct test_allocator_statistics {
   int time_to_throw = 0;
   int throw_after = INT_MAX;
-  int count = 0;
-  int alloc_count = 0;
+  int count           = 0;
+  int alloc_count     = 0;
   int construct_count = 0; // the number of times that ::construct was called
   int destroy_count = 0; // the number of times that ::destroy was called
   int copied = 0;
@@ -41,7 +42,7 @@ struct test_allocator_statistics {
     assert(count == 0 && "clearing leaking allocator data?");
     count = 0;
     time_to_throw = 0;
-    alloc_count = 0;
+    alloc_count     = 0;
     construct_count = 0;
     destroy_count = 0;
     throw_after = INT_MAX;
@@ -429,6 +430,193 @@ TEST_CONSTEXPR_CXX20 thread_unsafe_shared_ptr<T> make_thread_unsafe_shared(Args.
 }
 } // namespace detail
 
+template <class T>
+class fancy_pointer {
+public:
+  // For the std::pointer_traits interface.
+  using pointer         = T*;
+  using element_type    = T;
+  using difference_type = std::ptrdiff_t;
+
+  template <class U>
+  using rebind = fancy_pointer<U>;
+
+  // For the std::iterator_traits interface.
+  using value_type        = typename std::remove_cv<T>::type;
+  using reference         = typename std::add_lvalue_reference<T>::type;
+  using iterator_category = std::random_access_iterator_tag;
+
+  TEST_CONSTEXPR_CXX14 fancy_pointer() TEST_NOEXCEPT : ptr_(nullptr) {}
+  TEST_CONSTEXPR_CXX14 fancy_pointer(T* p) TEST_NOEXCEPT : ptr_(p) {}
+
+  template <typename T2>
+  TEST_CONSTEXPR_CXX14 fancy_pointer(const fancy_pointer<T2>& other) TEST_NOEXCEPT : ptr_(other.get()) {}
+
+  TEST_CONSTEXPR_CXX14 operator T*() const TEST_NOEXCEPT { return ptr_; }
+  TEST_CONSTEXPR_CXX14 fancy_pointer(fancy_pointer&&) TEST_NOEXCEPT                 = default;
+  TEST_CONSTEXPR_CXX14 fancy_pointer(const fancy_pointer&) TEST_NOEXCEPT            = default;
+  TEST_CONSTEXPR_CXX14 fancy_pointer& operator=(fancy_pointer&&) TEST_NOEXCEPT      = default;
+  TEST_CONSTEXPR_CXX14 fancy_pointer& operator=(const fancy_pointer&) TEST_NOEXCEPT = default;
+  TEST_CONSTEXPR_CXX20 ~fancy_pointer() TEST_NOEXCEPT                               = default; // {}
+  TEST_CONSTEXPR_CXX14 operator fancy_pointer<const T>() const TEST_NOEXCEPT { return fancy_pointer<const T>(get()); }
+  TEST_CONSTEXPR_CXX14 T& operator*() const TEST_NOEXCEPT { return *ptr_; }
+  TEST_CONSTEXPR_CXX14 T* operator->() const TEST_NOEXCEPT { return ptr_; }
+  TEST_CONSTEXPR_CXX14 explicit operator bool() const TEST_NOEXCEPT { return ptr_; }
+  TEST_CONSTEXPR_CXX14 T* get() const TEST_NOEXCEPT { return ptr_; }
+
+  TEST_CONSTEXPR_CXX14 fancy_pointer& operator++() TEST_NOEXCEPT {
+    ++ptr_;
+    return *this;
+  }
+  TEST_CONSTEXPR_CXX14 fancy_pointer operator++(int) TEST_NOEXCEPT {
+    fancy_pointer tmp(*this);
+    ++ptr_;
+    return tmp;
+  }
+
+  TEST_CONSTEXPR_CXX14 fancy_pointer& operator--() TEST_NOEXCEPT {
+    --ptr_;
+    return *this;
+  }
+  TEST_CONSTEXPR_CXX14 fancy_pointer operator--(int) TEST_NOEXCEPT {
+    fancy_pointer tmp(*this);
+    --ptr_;
+    return tmp;
+  }
+
+  TEST_CONSTEXPR_CXX14 fancy_pointer& operator+=(difference_type n) TEST_NOEXCEPT {
+    ptr_ += n;
+    return *this;
+  }
+
+  TEST_CONSTEXPR_CXX14 fancy_pointer& operator-=(difference_type n) TEST_NOEXCEPT {
+    ptr_ -= n;
+    return *this;
+  }
+
+  TEST_CONSTEXPR_CXX14 fancy_pointer operator+(difference_type n) const TEST_NOEXCEPT {
+    fancy_pointer tmp(*this);
+    tmp += n;
+    return tmp;
+  }
+
+  TEST_CONSTEXPR_CXX14 fancy_pointer operator-(difference_type n) const TEST_NOEXCEPT {
+    fancy_pointer tmp(*this);
+    tmp -= n;
+    return tmp;
+  }
+
+  TEST_CONSTEXPR_CXX14 reference operator[](difference_type n) const TEST_NOEXCEPT { return ptr_[n]; }
+
+  friend TEST_CONSTEXPR_CXX14 fancy_pointer operator+(difference_type x, fancy_pointer y) TEST_NOEXCEPT {
+    return y + x;
+  }
+
+  friend TEST_CONSTEXPR_CXX14 bool operator<(fancy_pointer x, fancy_pointer y) TEST_NOEXCEPT { return x.ptr_ < y.ptr_; }
+  friend TEST_CONSTEXPR_CXX14 bool operator>(fancy_pointer x, fancy_pointer y) TEST_NOEXCEPT { return y < x; }
+  friend TEST_CONSTEXPR_CXX14 bool operator<=(fancy_pointer x, fancy_pointer y) TEST_NOEXCEPT { return !(y < x); }
+  friend TEST_CONSTEXPR_CXX14 bool operator>=(fancy_pointer x, fancy_pointer y) TEST_NOEXCEPT { return !(x < y); }
+
+  static TEST_CONSTEXPR_CXX14 fancy_pointer pointer_to(reference ref) TEST_NOEXCEPT { return fancy_pointer(&ref); }
+
+  T* ptr_;
+};
+
+template <typename T>
+TEST_CONSTEXPR_CXX14 typename fancy_pointer<T>::difference_type
+operator-(fancy_pointer<T> x, fancy_pointer<T> y) TEST_NOEXCEPT {
+  return x.ptr_ - y.ptr_;
+}
+
+template <typename T>
+TEST_CONSTEXPR_CXX14 typename fancy_pointer<T>::difference_type
+operator-(fancy_pointer<const T> x, fancy_pointer<T> y) TEST_NOEXCEPT {
+  return x.ptr_ - y.ptr_;
+}
+
+template <typename T>
+TEST_CONSTEXPR_CXX14 typename fancy_pointer<T>::difference_type
+operator-(fancy_pointer<T> x, fancy_pointer<const T> y) TEST_NOEXCEPT {
+  return x.ptr_ - y.ptr_;
+}
+
+template <typename T>
+TEST_CONSTEXPR_CXX14 typename fancy_pointer<T>::difference_type
+operator-(fancy_pointer<const T> x, fancy_pointer<const T> y) TEST_NOEXCEPT {
+  return x.ptr_ - y.ptr_;
+}
+
+template <typename T>
+TEST_CONSTEXPR_CXX14 bool operator==(fancy_pointer<T> x, fancy_pointer<T> y) TEST_NOEXCEPT {
+  return x.get() == y.get();
+}
+
+template <typename T>
+TEST_CONSTEXPR_CXX14 bool operator==(fancy_pointer<const T> x, fancy_pointer<T> y) TEST_NOEXCEPT {
+  return x.get() == y.get();
+}
+
+template <typename T>
+TEST_CONSTEXPR_CXX14 bool operator==(fancy_pointer<T> x, fancy_pointer<const T> y) TEST_NOEXCEPT {
+  return x.get() == y.get();
+}
+
+template <typename T>
+TEST_CONSTEXPR_CXX14 bool operator==(fancy_pointer<const T> x, fancy_pointer<const T> y) TEST_NOEXCEPT {
+  return x.get() == y.get();
+}
+
+template <typename T>
+TEST_CONSTEXPR_CXX14 bool operator!=(fancy_pointer<T> x, fancy_pointer<T> y) TEST_NOEXCEPT {
+  return !(x == y);
+}
+
+template <typename T>
+TEST_CONSTEXPR_CXX14 bool operator!=(fancy_pointer<const T> x, fancy_pointer<T> y) TEST_NOEXCEPT {
+  return !(x == y);
+}
+
+template <typename T>
+TEST_CONSTEXPR_CXX14 bool operator!=(fancy_pointer<T> x, fancy_pointer<const T> y) TEST_NOEXCEPT {
+  return !(x == y);
+}
+
+template <typename T>
+TEST_CONSTEXPR_CXX14 bool operator!=(fancy_pointer<const T> x, fancy_pointer<const T> y) TEST_NOEXCEPT {
+  return !(x == y);
+}
+
+template <class T>
+class fancy_pointer_allocator : public std::allocator<T> {
+  typedef std::allocator<T> base;
+
+public:
+  typedef T value_type;
+  typedef fancy_pointer<T> pointer;
+  typedef fancy_pointer<const T> const_pointer;
+  typedef value_type& reference;
+  typedef const value_type& const_reference;
+  typedef std::size_t size_type;
+  typedef std::ptrdiff_t difference_type;
+
+  template <class U>
+  struct rebind {
+    typedef fancy_pointer_allocator<U> other;
+  };
+
+  TEST_CONSTEXPR_CXX20 fancy_pointer_allocator() TEST_NOEXCEPT {}
+
+  template <class U>
+  TEST_CONSTEXPR explicit fancy_pointer_allocator(fancy_pointer_allocator<U>) TEST_NOEXCEPT {}
+
+  TEST_CONSTEXPR_CXX20 pointer allocate(size_t n) { return base::allocate(n); }
+  TEST_CONSTEXPR_CXX20 void deallocate(pointer p, size_t n) { return base::deallocate(p, n); }
+
+#if TEST_STD_VER > 20
+  TEST_CONSTEXPR_CXX20 std::allocation_result<pointer> allocate_at_least(std::size_t n) { return {allocate(n), n}; }
+#endif
+};
+
 template <class T, std::size_t N>
 class limited_allocator {
   template <class U, std::size_t UN>



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