[libcxx-commits] [libcxx] [libc++] Refactor some forward declarations to avoid unnecessary dependencies (PR #81368)

Nikolas Klauser via libcxx-commits libcxx-commits at lists.llvm.org
Sat Feb 10 09:39:18 PST 2024 

https://github.com/philnik777 created https://github.com/llvm/llvm-project/pull/81368

This patch moves the contens of `__fwd/get.h` to the corresponding forward declarations they belong and refactors `__tuple_like_impl` to a template variable that is specialized in the forward declarations headers of the tuple-like types instead of a central place. This avoids transitive includes, since the dependencies of some tuple-like types don't get included in headers which define different tuple-like types anymore.


>From d35a4dbdb1d74e56837a3415d2ba449cce3633cd Mon Sep 17 00:00:00 2001
From: Nikolas Klauser <nikolasklauser at berlin.de>
Date: Sat, 10 Feb 2024 18:32:48 +0100
Subject: [PATCH] [libc++] Refactor some forward declarations to avoid
 unnecessary dependencies

---
 libcxx/include/CMakeLists.txt             |  2 -
 libcxx/include/__fwd/array.h              | 22 +++++
 libcxx/include/__fwd/get.h                | 99 -----------------------
 libcxx/include/__fwd/pair.h               | 27 +++++++
 libcxx/include/__fwd/subrange.h           | 19 ++++-
 libcxx/include/__fwd/tuple.h              | 37 +++++++++
 libcxx/include/__memory/compressed_pair.h |  1 -
 libcxx/include/__ranges/elements_view.h   |  3 +-
 libcxx/include/__ranges/subrange.h        |  1 -
 libcxx/include/__tuple/pair_like.h        |  2 +-
 libcxx/include/__tuple/tuple_like.h       | 51 ------------
 libcxx/include/__utility/pair.h           |  1 -
 libcxx/include/istream                    |  1 +
 libcxx/include/streambuf                  |  1 +
 libcxx/include/tuple                      |  1 -
 15 files changed, 107 insertions(+), 161 deletions(-)
 delete mode 100644 libcxx/include/__fwd/get.h
 delete mode 100644 libcxx/include/__tuple/tuple_like.h

diff --git a/libcxx/include/CMakeLists.txt b/libcxx/include/CMakeLists.txt
index 6ded426640f0d0..e1afb8679b1a97 100644
--- a/libcxx/include/CMakeLists.txt
+++ b/libcxx/include/CMakeLists.txt
@@ -427,7 +427,6 @@ set(files
   __fwd/array.h
   __fwd/bit_reference.h
   __fwd/fstream.h
-  __fwd/get.h
   __fwd/hash.h
   __fwd/ios.h
   __fwd/istream.h
@@ -703,7 +702,6 @@ set(files
   __tuple/sfinae_helpers.h
   __tuple/tuple_element.h
   __tuple/tuple_indices.h
-  __tuple/tuple_like.h
   __tuple/tuple_like_ext.h
   __tuple/tuple_size.h
   __tuple/tuple_types.h
diff --git a/libcxx/include/__fwd/array.h b/libcxx/include/__fwd/array.h
index 9a79effb617d26..c4eac16c40a2ea 100644
--- a/libcxx/include/__fwd/array.h
+++ b/libcxx/include/__fwd/array.h
@@ -10,6 +10,7 @@
 #define _LIBCPP___FWD_ARRAY_H
 
 #include <__config>
+#include <__fwd/tuple.h>
 #include <cstddef>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
@@ -21,6 +22,27 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 template <class _Tp, size_t _Size>
 struct _LIBCPP_TEMPLATE_VIS array;
 
+#if _LIBCPP_STD_VER >= 20
+
+template <class _Tp, size_t _Size>
+inline constexpr bool __is_tuple_like_v<array<_Tp, _Size>> = true;
+
+#endif
+
+template <size_t _Ip, class _Tp, size_t _Size>
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Tp& get(array<_Tp, _Size>&) _NOEXCEPT;
+
+template <size_t _Ip, class _Tp, size_t _Size>
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Tp& get(const array<_Tp, _Size>&) _NOEXCEPT;
+
+#ifndef _LIBCPP_CXX03_LANG
+template <size_t _Ip, class _Tp, size_t _Size>
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Tp&& get(array<_Tp, _Size>&&) _NOEXCEPT;
+
+template <size_t _Ip, class _Tp, size_t _Size>
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Tp&& get(const array<_Tp, _Size>&&) _NOEXCEPT;
+#endif
+
 _LIBCPP_END_NAMESPACE_STD
 
 #endif // _LIBCPP___FWD_ARRAY_H
diff --git a/libcxx/include/__fwd/get.h b/libcxx/include/__fwd/get.h
deleted file mode 100644
index e7261b826953d7..00000000000000
--- a/libcxx/include/__fwd/get.h
+++ /dev/null
@@ -1,99 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef _LIBCPP___FWD_GET_H
-#define _LIBCPP___FWD_GET_H
-
-#include <__concepts/copyable.h>
-#include <__config>
-#include <__fwd/array.h>
-#include <__fwd/pair.h>
-#include <__fwd/subrange.h>
-#include <__fwd/tuple.h>
-#include <__tuple/tuple_element.h>
-#include <cstddef>
-
-#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
-#  pragma GCC system_header
-#endif
-
-_LIBCPP_BEGIN_NAMESPACE_STD
-
-#ifndef _LIBCPP_CXX03_LANG
-
-template <size_t _Ip, class... _Tp>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, tuple<_Tp...> >::type&
-get(tuple<_Tp...>&) _NOEXCEPT;
-
-template <size_t _Ip, class... _Tp>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, tuple<_Tp...> >::type&
-get(const tuple<_Tp...>&) _NOEXCEPT;
-
-template <size_t _Ip, class... _Tp>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, tuple<_Tp...> >::type&&
-get(tuple<_Tp...>&&) _NOEXCEPT;
-
-template <size_t _Ip, class... _Tp>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, tuple<_Tp...> >::type&&
-get(const tuple<_Tp...>&&) _NOEXCEPT;
-
-#endif //_LIBCPP_CXX03_LANG
-
-template <size_t _Ip, class _T1, class _T2>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, pair<_T1, _T2> >::type&
-get(pair<_T1, _T2>&) _NOEXCEPT;
-
-template <size_t _Ip, class _T1, class _T2>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
-get(const pair<_T1, _T2>&) _NOEXCEPT;
-
-#ifndef _LIBCPP_CXX03_LANG
-template <size_t _Ip, class _T1, class _T2>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
-get(pair<_T1, _T2>&&) _NOEXCEPT;
-
-template <size_t _Ip, class _T1, class _T2>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
-get(const pair<_T1, _T2>&&) _NOEXCEPT;
-#endif
-
-template <size_t _Ip, class _Tp, size_t _Size>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Tp& get(array<_Tp, _Size>&) _NOEXCEPT;
-
-template <size_t _Ip, class _Tp, size_t _Size>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Tp& get(const array<_Tp, _Size>&) _NOEXCEPT;
-
-#ifndef _LIBCPP_CXX03_LANG
-template <size_t _Ip, class _Tp, size_t _Size>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Tp&& get(array<_Tp, _Size>&&) _NOEXCEPT;
-
-template <size_t _Ip, class _Tp, size_t _Size>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Tp&& get(const array<_Tp, _Size>&&) _NOEXCEPT;
-#endif
-
-#if _LIBCPP_STD_VER >= 20
-
-namespace ranges {
-
-template <size_t _Index, class _Iter, class _Sent, subrange_kind _Kind>
-  requires((_Index == 0 && copyable<_Iter>) || _Index == 1)
-_LIBCPP_HIDE_FROM_ABI constexpr auto get(const subrange<_Iter, _Sent, _Kind>& __subrange);
-
-template <size_t _Index, class _Iter, class _Sent, subrange_kind _Kind>
-  requires(_Index < 2)
-_LIBCPP_HIDE_FROM_ABI constexpr auto get(subrange<_Iter, _Sent, _Kind>&& __subrange);
-
-} // namespace ranges
-
-using ranges::get;
-
-#endif // _LIBCPP_STD_VER >= 20
-
-_LIBCPP_END_NAMESPACE_STD
-
-#endif // _LIBCPP___FWD_GET_H
diff --git a/libcxx/include/__fwd/pair.h b/libcxx/include/__fwd/pair.h
index 3844014de3adbd..7ec0949d385343 100644
--- a/libcxx/include/__fwd/pair.h
+++ b/libcxx/include/__fwd/pair.h
@@ -10,6 +10,8 @@
 #define _LIBCPP___FWD_PAIR_H
 
 #include <__config>
+#include <__fwd/tuple.h>
+#include <cstddef>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -20,6 +22,31 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 template <class, class>
 struct _LIBCPP_TEMPLATE_VIS pair;
 
+#if _LIBCPP_STD_VER >= 20
+
+template <class _T1, class _T2>
+inline constexpr bool __is_tuple_like_v<pair<_T1, _T2>> = true;
+
+#endif
+
+template <size_t _Ip, class _T1, class _T2>
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, pair<_T1, _T2> >::type&
+get(pair<_T1, _T2>&) _NOEXCEPT;
+
+template <size_t _Ip, class _T1, class _T2>
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
+get(const pair<_T1, _T2>&) _NOEXCEPT;
+
+#ifndef _LIBCPP_CXX03_LANG
+template <size_t _Ip, class _T1, class _T2>
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
+get(pair<_T1, _T2>&&) _NOEXCEPT;
+
+template <size_t _Ip, class _T1, class _T2>
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
+get(const pair<_T1, _T2>&&) _NOEXCEPT;
+#endif
+
 _LIBCPP_END_NAMESPACE_STD
 
 #endif // _LIBCPP___FWD_PAIR_H
diff --git a/libcxx/include/__fwd/subrange.h b/libcxx/include/__fwd/subrange.h
index d09b9b1c5b97bc..61f3c3a62a9511 100644
--- a/libcxx/include/__fwd/subrange.h
+++ b/libcxx/include/__fwd/subrange.h
@@ -9,7 +9,11 @@
 #ifndef _LIBCPP___FWD_SUBRANGE_H
 #define _LIBCPP___FWD_SUBRANGE_H
 
+#include <__concepts/copyable.h>
 #include <__config>
+#include <__fwd/tuple.h>
+#include <__iterator/concepts.h>
+#include <cstddef>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -17,8 +21,6 @@
 
 #if _LIBCPP_STD_VER >= 20
 
-#  include <__iterator/concepts.h>
-
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 namespace ranges {
@@ -29,8 +31,21 @@ template <input_or_output_iterator _Iter, sentinel_for<_Iter> _Sent, subrange_ki
   requires(_Kind == subrange_kind::sized || !sized_sentinel_for<_Sent, _Iter>)
 class _LIBCPP_TEMPLATE_VIS subrange;
 
+template <size_t _Index, class _Iter, class _Sent, subrange_kind _Kind>
+  requires((_Index == 0 && copyable<_Iter>) || _Index == 1)
+_LIBCPP_HIDE_FROM_ABI constexpr auto get(const subrange<_Iter, _Sent, _Kind>&);
+
+template <size_t _Index, class _Iter, class _Sent, subrange_kind _Kind>
+  requires(_Index < 2)
+_LIBCPP_HIDE_FROM_ABI constexpr auto get(subrange<_Iter, _Sent, _Kind>&&);
+
 } // namespace ranges
 
+using ranges::get;
+
+template <class _Ip, class _Sp, ranges::subrange_kind _Kp>
+inline constexpr bool __is_tuple_like_v<ranges::subrange<_Ip, _Sp, _Kp>> = true;
+
 _LIBCPP_END_NAMESPACE_STD
 
 #endif // _LIBCPP_STD_VER >= 20
diff --git a/libcxx/include/__fwd/tuple.h b/libcxx/include/__fwd/tuple.h
index 16b3fabbb99516..d6e244988cdc6d 100644
--- a/libcxx/include/__fwd/tuple.h
+++ b/libcxx/include/__fwd/tuple.h
@@ -10,6 +10,8 @@
 #define _LIBCPP___FWD_TUPLE_H
 
 #include <__config>
+#include <__type_traits/remove_cvref.h>
+#include <cstddef>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -22,6 +24,41 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 template <class...>
 class _LIBCPP_TEMPLATE_VIS tuple;
 
+template <size_t, class>
+struct _LIBCPP_TEMPLATE_VIS tuple_element;
+
+template <class>
+struct _LIBCPP_TEMPLATE_VIS tuple_size;
+
+#if _LIBCPP_STD_VER >= 20
+
+template <class _Tp>
+inline constexpr bool __is_tuple_like_v = false;
+
+template <class... _Types>
+inline constexpr bool __is_tuple_like_v<tuple<_Types...>> = true;
+
+template <class _Tp>
+concept __tuple_like = __is_tuple_like_v<remove_cvref_t<_Tp>>;
+
+#  endif // _LIBCPP_STD_VER >= 20
+
+template <size_t _Ip, class... _Tp>
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, tuple<_Tp...> >::type&
+get(tuple<_Tp...>&) _NOEXCEPT;
+
+template <size_t _Ip, class... _Tp>
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, tuple<_Tp...> >::type&
+get(const tuple<_Tp...>&) _NOEXCEPT;
+
+template <size_t _Ip, class... _Tp>
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 typename tuple_element<_Ip, tuple<_Tp...> >::type&&
+get(tuple<_Tp...>&&) _NOEXCEPT;
+
+template <size_t _Ip, class... _Tp>
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const typename tuple_element<_Ip, tuple<_Tp...> >::type&&
+get(const tuple<_Tp...>&&) _NOEXCEPT;
+
 #endif // _LIBCPP_CXX03_LANG
 
 _LIBCPP_END_NAMESPACE_STD
diff --git a/libcxx/include/__memory/compressed_pair.h b/libcxx/include/__memory/compressed_pair.h
index e9faada2f0b23b..a28f8525f6aeaa 100644
--- a/libcxx/include/__memory/compressed_pair.h
+++ b/libcxx/include/__memory/compressed_pair.h
@@ -11,7 +11,6 @@
 #define _LIBCPP___MEMORY_COMPRESSED_PAIR_H
 
 #include <__config>
-#include <__fwd/get.h>
 #include <__fwd/tuple.h>
 #include <__tuple/tuple_indices.h>
 #include <__type_traits/decay.h>
diff --git a/libcxx/include/__ranges/elements_view.h b/libcxx/include/__ranges/elements_view.h
index 989d36fbcaaae5..d7428102199b58 100644
--- a/libcxx/include/__ranges/elements_view.h
+++ b/libcxx/include/__ranges/elements_view.h
@@ -16,7 +16,7 @@
 #include <__concepts/derived_from.h>
 #include <__concepts/equality_comparable.h>
 #include <__config>
-#include <__fwd/get.h>
+#include <__fwd/tuple.h>
 #include <__iterator/concepts.h>
 #include <__iterator/iterator_traits.h>
 #include <__ranges/access.h>
@@ -27,7 +27,6 @@
 #include <__ranges/size.h>
 #include <__ranges/view_interface.h>
 #include <__tuple/tuple_element.h>
-#include <__tuple/tuple_like.h>
 #include <__tuple/tuple_size.h>
 #include <__type_traits/is_reference.h>
 #include <__type_traits/maybe_const.h>
diff --git a/libcxx/include/__ranges/subrange.h b/libcxx/include/__ranges/subrange.h
index a41978275b787f..bb4411cf355497 100644
--- a/libcxx/include/__ranges/subrange.h
+++ b/libcxx/include/__ranges/subrange.h
@@ -17,7 +17,6 @@
 #include <__concepts/derived_from.h>
 #include <__concepts/different_from.h>
 #include <__config>
-#include <__fwd/get.h>
 #include <__fwd/subrange.h>
 #include <__iterator/advance.h>
 #include <__iterator/concepts.h>
diff --git a/libcxx/include/__tuple/pair_like.h b/libcxx/include/__tuple/pair_like.h
index 192682dc7eb598..e1b489dc19a57a 100644
--- a/libcxx/include/__tuple/pair_like.h
+++ b/libcxx/include/__tuple/pair_like.h
@@ -10,7 +10,7 @@
 #define _LIBCPP___TUPLE_PAIR_LIKE_H
 
 #include <__config>
-#include <__tuple/tuple_like.h>
+#include <__fwd/tuple.h>
 #include <__tuple/tuple_size.h>
 #include <__type_traits/remove_cvref.h>
 
diff --git a/libcxx/include/__tuple/tuple_like.h b/libcxx/include/__tuple/tuple_like.h
deleted file mode 100644
index dab395be616b7d..00000000000000
--- a/libcxx/include/__tuple/tuple_like.h
+++ /dev/null
@@ -1,51 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef _LIBCPP___TUPLE_TUPLE_LIKE_H
-#define _LIBCPP___TUPLE_TUPLE_LIKE_H
-
-#include <__config>
-#include <__fwd/array.h>
-#include <__fwd/pair.h>
-#include <__fwd/subrange.h>
-#include <__fwd/tuple.h>
-#include <__type_traits/integral_constant.h>
-#include <__type_traits/remove_cvref.h>
-#include <cstddef>
-
-#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
-#  pragma GCC system_header
-#endif
-
-_LIBCPP_BEGIN_NAMESPACE_STD
-
-#if _LIBCPP_STD_VER >= 20
-
-template <class _Tp>
-struct __tuple_like_impl : false_type {};
-
-template <class... _Tp>
-struct __tuple_like_impl<tuple<_Tp...> > : true_type {};
-
-template <class _T1, class _T2>
-struct __tuple_like_impl<pair<_T1, _T2> > : true_type {};
-
-template <class _Tp, size_t _Size>
-struct __tuple_like_impl<array<_Tp, _Size> > : true_type {};
-
-template <class _Ip, class _Sp, ranges::subrange_kind _Kp>
-struct __tuple_like_impl<ranges::subrange<_Ip, _Sp, _Kp> > : true_type {};
-
-template <class _Tp>
-concept __tuple_like = __tuple_like_impl<remove_cvref_t<_Tp>>::value;
-
-#endif // _LIBCPP_STD_VER >= 20
-
-_LIBCPP_END_NAMESPACE_STD
-
-#endif // _LIBCPP___TUPLE_TUPLE_LIKE_H
diff --git a/libcxx/include/__utility/pair.h b/libcxx/include/__utility/pair.h
index 577e23198812b4..0db6f7f6021347 100644
--- a/libcxx/include/__utility/pair.h
+++ b/libcxx/include/__utility/pair.h
@@ -14,7 +14,6 @@
 #include <__concepts/different_from.h>
 #include <__config>
 #include <__fwd/array.h>
-#include <__fwd/get.h>
 #include <__fwd/pair.h>
 #include <__fwd/subrange.h>
 #include <__fwd/tuple.h>
diff --git a/libcxx/include/istream b/libcxx/include/istream
index 1c7fb992dff429..0d05a26091a4b3 100644
--- a/libcxx/include/istream
+++ b/libcxx/include/istream
@@ -167,6 +167,7 @@ template <class Stream, class T>
 #include <__type_traits/is_base_of.h>
 #include <__utility/declval.h>
 #include <__utility/forward.h>
+#include <bitset>
 #include <ostream>
 #include <version>
 
diff --git a/libcxx/include/streambuf b/libcxx/include/streambuf
index 577ad340d03335..aad7686a435cbc 100644
--- a/libcxx/include/streambuf
+++ b/libcxx/include/streambuf
@@ -110,6 +110,7 @@ protected:
 #include <__assert> // all public C++ headers provide the assertion handler
 #include <__config>
 #include <__fwd/streambuf.h>
+#include <__type_traits/is_same.h>
 #include <climits>
 #include <ios>
 #include <iosfwd>
diff --git a/libcxx/include/tuple b/libcxx/include/tuple
index c41e9242a5a870..cb20d274309740 100644
--- a/libcxx/include/tuple
+++ b/libcxx/include/tuple
@@ -211,7 +211,6 @@ template <class... Types>
 #include <__config>
 #include <__functional/invoke.h>
 #include <__fwd/array.h>
-#include <__fwd/get.h>
 #include <__fwd/tuple.h>
 #include <__memory/allocator_arg_t.h>
 #include <__memory/uses_allocator.h>

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