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[clang][NFC] Mark CWG988 as implemented and add a test (#196889)

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[CWG988](https://wg21.link/cwg988) specifies that reference collapsing
is performed when trying to form a reference to a `decltype`. Clang
implements this since 2.7: https://godbolt.org/z/vYzKbv8x7 (and I
checked a few versions after that to make sure there were no
regressions).
This commit is contained in:
Victor Chernyakin 2026-05-11 07:43:45 -07:00 committed by GitHub
parent cc4922b276
commit bd0aad5531
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2 changed files with 12 additions and 1 deletions
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11
clang/test/CXX/drs/cwg9xx.cpp
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@ -169,6 +169,17 @@ enum struct E4 : int { e = static_cast<int>(E4()) };
#endif
} // namespace cwg977
namespace cwg988 { // cwg988: 2.7
#if __cplusplus >= 201103L
void f(int& lvalue_ref, int&& rvalue_ref) {
static_assert(__is_same(decltype(lvalue_ref)&, int&), "");
static_assert(__is_same(decltype(lvalue_ref)&&, int&), "");
static_assert(__is_same(decltype(rvalue_ref)&, int&), "");
static_assert(__is_same(decltype(rvalue_ref)&&, int&&), "");
}
#endif
} // namespace cwg988
namespace cwg990 { // cwg990: 3.5
#if __cplusplus >= 201103L
struct A { // #cwg990-A

2
clang/www/cxx_dr_status.html
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@ -6693,7 +6693,7 @@
<td>[<a href="https://wg21.link/dcl.type.simple">dcl.type.simple</a>]</td>
<td>CD2</td>
<td>Reference-to-reference collapsing with <TT>decltype</TT></td>
<td class="unknown" align="center">Unknown</td>
<td class="full" align="center">Clang 2.7</td>
</tr>
<tr id="989">
<td><a href="https://cplusplus.github.io/CWG/issues/989.html">989</a></td>