[clang] aa7aedd - [clang] Add test for CWG1837

[Vlad Serebrennikov via cfe-commits]

Author: Vlad Serebrennikov
Date: 2023-04-11T22:15:11+03:00
New Revision: aa7aedd8ea3f75ddfb3004b81f09c5f653bc8fec

URL: https://github.com/llvm/llvm-project/commit/aa7aedd8ea3f75ddfb3004b81f09c5f653bc8fec
DIFF: https://github.com/llvm/llvm-project/commit/aa7aedd8ea3f75ddfb3004b81f09c5f653bc8fec.diff

LOG: [clang] Add test for CWG1837

[[https://wg21.link/p1787 | P1787]]: CWG1837 is resolved by restricting `this` to referring to the innermost enclosing class.
Wording: see changes to [expr.prim.this] and [expr.prim.lambda].

Reviewed By: #clang-language-wg, erichkeane

Differential Revision: https://reviews.llvm.org/D148035

Added: 
    

Modified: 
    clang/test/CXX/drs/dr18xx.cpp
    clang/www/cxx_dr_status.html

Removed: 
    


################################################################################
diff  --git a/clang/test/CXX/drs/dr18xx.cpp b/clang/test/CXX/drs/dr18xx.cpp
index 55f79295934c..02739cd2c000 100644
--- a/clang/test/CXX/drs/dr18xx.cpp
+++ b/clang/test/CXX/drs/dr18xx.cpp
@@ -2,7 +2,8 @@
 // RUN: %clang_cc1 -std=c++11 -triple x86_64-unknown-unknown %s -verify -fexceptions -Wno-deprecated-builtins -fcxx-exceptions -pedantic-errors
 // RUN: %clang_cc1 -std=c++14 -triple x86_64-unknown-unknown %s -verify -fexceptions -Wno-deprecated-builtins -fcxx-exceptions -pedantic-errors
 // RUN: %clang_cc1 -std=c++17 -triple x86_64-unknown-unknown %s -verify -fexceptions -Wno-deprecated-builtins -fcxx-exceptions -pedantic-errors
-// RUN: %clang_cc1 -std=c++2a -triple x86_64-unknown-unknown %s -verify -fexceptions -Wno-deprecated-builtins -fcxx-exceptions -pedantic-errors
+// RUN: %clang_cc1 -std=c++20 -triple x86_64-unknown-unknown %s -verify -fexceptions -Wno-deprecated-builtins -fcxx-exceptions -pedantic-errors
+// RUN: %clang_cc1 -std=c++2b -triple x86_64-unknown-unknown %s -verify -fexceptions -Wno-deprecated-builtins -fcxx-exceptions -pedantic-errors
 
 #if __cplusplus < 201103L
 // expected-error at +1 {{variadic macro}}
@@ -59,6 +60,43 @@ namespace dr1822 { // dr1822: yes
 #endif
 }
 
+namespace dr1837 { // dr1837: 3.3
+#if __cplusplus >= 201103L
+  template <typename T>
+  struct Fish { static const bool value = true; };
+
+  struct Other {
+    int p();
+    auto q() -> decltype(p()) *;
+  };
+
+  class Outer {
+    friend auto Other::q() -> decltype(this->p()) *; // expected-error {{invalid use of 'this'}}
+    int g();
+    int f() {
+      extern void f(decltype(this->g()) *);
+      struct Inner {
+        static_assert(Fish<decltype(this->g())>::value, ""); // expected-error {{invalid use of 'this'}}
+        enum { X = Fish<decltype(this->f())>::value }; // expected-error {{invalid use of 'this'}}
+        struct Inner2 : Fish<decltype(this->g())> { }; // expected-error {{invalid use of 'this'}}
+        friend void f(decltype(this->g()) *); // expected-error {{invalid use of 'this'}}
+        friend auto Other::q() -> decltype(this->p()) *; // expected-error {{invalid use of 'this'}}
+      };
+      return 0;
+    }
+  };
+
+  struct A {
+    int f();
+    bool b = [] {
+      struct Local {
+        static_assert(sizeof(this->f()) == sizeof(int), "");
+      };
+    };
+  };
+#endif
+}
+
 namespace dr1872 { // dr1872: 9
 #if __cplusplus >= 201103L
   template<typename T> struct A : T {

diff  --git a/clang/www/cxx_dr_status.html b/clang/www/cxx_dr_status.html
index 67350fa35938..bac8a52c2d5b 100755
--- a/clang/www/cxx_dr_status.html
+++ b/clang/www/cxx_dr_status.html
@@ -10829,7 +10829,7 @@ <h2 id="cxxdr">C++ defect report implementation status</h2>
     <td><a href="https://wg21.link/cwg1837">1837</a></td>
     <td>CD6</td>
     <td>Use of <TT>this</TT> in <TT>friend</TT> and local class declarations</td>
-    <td class="none" align="center">Unknown</td>
+    <td class="full" align="center">Clang 3.3</td>
   </tr>
   <tr id="1838">
     <td><a href="https://wg21.link/cwg1838">1838</a></td>