[Bug libstdc++/125450] New: std::optional breaks in C++26 freestanding mode

[debashish47 at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125450

            Bug ID: 125450
           Summary: std::optional breaks in C++26 freestanding mode
           Product: gcc
           Version: 16.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: debashish47 at gmail dot com
  Target Milestone: ---

Compilation fails when using std::optional in C++26 freestanding mode (since
GCC 16 onwards)

Code:
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// -std=c++26 -fno-exceptions -fno-rtti -ffreestanding -nostdlib
#include <optional>

static_assert(!std::optional<int>{}.has_value());

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Reference: https://godbolt.org/z/WGE9eefYT