[PATCH] D134145: [Clang] Implement fix for DR2628

[Roy Jacobson via Phabricator via cfe-commits]

royjacobson updated this revision to Diff 461352.
royjacobson added a comment.

rebase on main


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D134145/new/

https://reviews.llvm.org/D134145

Files:
  clang/docs/ReleaseNotes.rst
  clang/lib/Sema/SemaTemplate.cpp
  clang/test/CXX/drs/dr26xx.cpp


Index: clang/test/CXX/drs/dr26xx.cpp
===================================================================
--- /dev/null
+++ clang/test/CXX/drs/dr26xx.cpp
@@ -0,0 +1,16 @@
+// RUN: %clang_cc1 -std=c++20 -triple x86_64-unknown-unknown %s -verify
+
+namespace dr2628 { // dr2628: yes
+
+template <bool A = false, bool B = false>
+struct foo {
+  constexpr foo() requires (!A && !B) = delete; // #DR2628_CTOR
+  constexpr foo() requires (A || B) = delete;
+};
+
+void f() {
+  foo fooable; // expected-error {{call to deleted}}
+  // expected-note@#DR2628_CTOR {{marked deleted here}}
+}
+
+}
Index: clang/lib/Sema/SemaTemplate.cpp
===================================================================
--- clang/lib/Sema/SemaTemplate.cpp
+++ clang/lib/Sema/SemaTemplate.cpp
@@ -2445,6 +2445,8 @@
                                       TInfo->getType(), TInfo, LocEnd, Ctor);
     Guide->setImplicit();
     Guide->setParams(Params);
+    if (Ctor && Ctor->getTrailingRequiresClause())
+      Guide->setTrailingRequiresClause(Ctor->getTrailingRequiresClause());
 
     for (auto *Param : Params)
       Param->setDeclContext(Guide);
Index: clang/docs/ReleaseNotes.rst
===================================================================
--- clang/docs/ReleaseNotes.rst
+++ clang/docs/ReleaseNotes.rst
@@ -151,6 +151,10 @@
   `Issue 57369 <https://github.com/llvm/llvm-project/issues/57369>`_
   `Issue 57643 <https://github.com/llvm/llvm-project/issues/57643>`_
   `Issue 57793 <https://github.com/llvm/llvm-project/issues/57793>`_
+- Respect constructor constraints during class template argument deduction (CTAD).
+  This is the suggested resolution to CWG DR2628.
+  `Issue 57646 <https://github.com/llvm/llvm-project/issues/57646>`_
+  `Issue 43829 <https://github.com/llvm/llvm-project/issues/43829>`_
 
 
 Improvements to Clang's diagnostics


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