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[clang][NFC] Mark CWG743 and CWG950 as implemented and add tests (#197015)

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[CWG743](https://wg21.link/cwg743) allows using `decltype` in a
*nested-name-specifier*, i.e.: `decltype(foo)::type`.
[CWG950](https://wg21.link/cwg950) allows using it as a
*base-specifier*, i.e.: `struct B : decltype(foo)`. Both these DRs were
resolved by [N3049](https://wg21.link/n3049).


Clang supports both of these since 3.1: https://godbolt.org/z/aohPs5zaa
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Victor Chernyakin 2026-05-12 06:28:13 -07:00 committed by GitHub
parent 6d22e10845
commit 3473ceaadc
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3 changed files with 25 additions and 2 deletions
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13
clang/test/CXX/drs/cwg7xx.cpp
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@ -335,6 +335,19 @@ namespace cwg727 { // cwg727: partial
Collision<int, int> c; // #cwg727-Collision-int-int
} // namespace cwg727
namespace cwg743 { // cwg743: 3.1
#if __cplusplus >= 201103L
struct S {
using T = int;
};
decltype(S())::T i;
template <typename T>
using foo = typename decltype(T())::I;
#endif
} // namespace cwg743
namespace cwg777 { // cwg777: 3.7
#if __cplusplus >= 201103L
template <typename... T>

10
clang/test/CXX/drs/cwg9xx.cpp
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@ -51,6 +51,16 @@ namespace cwg948 { // cwg948: 3.7
#endif
} // namespace cwg948
namespace cwg950 { // cwg950: 3.1
#if __cplusplus >= 201103L
struct A {};
struct B : decltype(A()) {};
template <typename T>
struct C : decltype(T()) {};
#endif
} // namespace cwg950
namespace cwg952 { // cwg952: 2.8
namespace example1 {
struct A {

4
clang/www/cxx_dr_status.html
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@ -5230,7 +5230,7 @@
<td>[<a href="https://wg21.link/expr.prim.general">expr.prim.general</a>]</td>
<td>CD2</td>
<td>Use of <TT>decltype</TT> in a <I>nested-name-specifier</I></td>
<td class="unknown" align="center">Unknown</td>
<td class="full" align="center">Clang 3.1</td>
</tr>
<tr id="744">
<td><a href="https://cplusplus.github.io/CWG/issues/744.html">744</a></td>
@ -6427,7 +6427,7 @@
<td>[<a href="https://wg21.link/dcl.type.simple">dcl.type.simple</a>]</td>
<td>CD2</td>
<td>Use of <TT>decltype</TT> as a <I>class-name</I></td>
<td class="unknown" align="center">Unknown</td>
<td class="full" align="center">Clang 3.1</td>
</tr>
<tr id="951">
<td><a href="https://cplusplus.github.io/CWG/issues/951.html">951</a></td>