[libcxx-commits] [libcxx] [libc++] Use availability to rely on key functions for bad_expected_access and bad_function_call (PR #87390)

[via libcxx-commits]

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@@ -0,0 +1,13 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include <expected>
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+const char* bad_expected_access<void>::what() const noexcept { return "bad access to std::expected"; }
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zibi2 wrote:

Thanks all. The `-std=c++20` was coming from down stream version of cmake which we need to update.

https://github.com/llvm/llvm-project/pull/87390