================ @@ -24,7 +21,12 @@ _LIBCPP_BEGIN_NAMESPACE_STD -#if !defined(_LIBCPP_CXX03_LANG) ---------------- philnik777 wrote: Yes. The non-C++03 version uses `noexcept()`, which isn't available in C++03. https://github.com/llvm/llvm-project/pull/95766