[libcxx-commits] [libcxx] [libc++] Fix ambiguity when using std::scoped_allocator constructor (PR #80020)

[Mark de Wever via libcxx-commits]

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@@ -197,6 +197,8 @@ struct __get_is_always_equal<_A0, _Allocs...> {
   static const bool value = allocator_traits<_A0>::is_always_equal::value && __get_is_always_equal<_Allocs...>::value;
 };
 
+struct __chained_ctor_tag {};
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mordante wrote:

Can you add some comment to this tag, preferably referring to the bug it fixes.

https://github.com/llvm/llvm-project/pull/80020