From 35c3b539438be2d587cbe8f2b9604a68bbe7792b Mon Sep 17 00:00:00 2001
From: Arthur O'Dwyer <arthur.j.odwyer@gmail.com>
Date: Tue, 8 Dec 2020 15:41:48 -0500
Subject: [PATCH] [libc++] ADL-proof __libcpp_is_nothrow_constructible.

The GCC C++20 buildbot hit this ADL call; Clang doesn't,
presumably because it uses a compiler builtin instead of
this codepath in <type_traits>.
https://buildkite.com/llvm-project/libcxx-ci/builds/674
---
 libcxx/include/type_traits | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libcxx/include/type_traits b/libcxx/include/type_traits
index cd6a1633df80..2842c905e302 100644
--- a/libcxx/include/type_traits
+++ b/libcxx/include/type_traits
@@ -1821,7 +1821,7 @@ template <typename _Tp>
 static void __test_noexcept(_Tp) noexcept;
 
 template<typename _Fm, typename _To>
-static bool_constant<noexcept(__test_noexcept<_To>(declval<_Fm>()))>
+static bool_constant<noexcept(_VSTD::__test_noexcept<_To>(declval<_Fm>()))>
 __is_nothrow_convertible_test();
 
 template <typename _Fm, typename _To>
@@ -3293,7 +3293,7 @@ void __implicit_conversion_to(_Tp) noexcept { }
 
 template <class _Tp, class _Arg>
 struct __libcpp_is_nothrow_constructible</*is constructible*/true, /*is reference*/true, _Tp, _Arg>
-    : public integral_constant<bool, noexcept(__implicit_conversion_to<_Tp>(declval<_Arg>()))>
+    : public integral_constant<bool, noexcept(_VSTD::__implicit_conversion_to<_Tp>(declval<_Arg>()))>
 {
 };