[libcxx-commits] [libcxx] [libcxx] Enrich message for std::bad_variant_access exception (PR #196495)

[Nikolas Klauser via libcxx-commits]

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@@ -309,11 +322,11 @@ struct __farray {
   _LIBCPP_HIDE_FROM_ABI constexpr const _Tp& operator[](size_t __n) const noexcept { return __buf_[__n]; }
 };
 
-[[noreturn]] inline _LIBCPP_HIDE_FROM_ABI void __throw_bad_variant_access() {
+[[noreturn]] inline _LIBCPP_HIDE_FROM_ABI void __throw_bad_variant_access(const char* __msg) {
 #    if _LIBCPP_HAS_EXCEPTIONS
-  throw bad_variant_access();
+  throw __bad_variant_access_with_msg(__msg);
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philnik777 wrote:

https://eel.is/c++draft/conforming#res.on.exception.handling-1 gives us permission to throw a derived class.

https://github.com/llvm/llvm-project/pull/196495