[Bug libstdc++/103879] error: accessing value of variant::_Copy_ctor_base through a 'const variant' glvalue in a constant expression

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103879

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
MSVC also rejects it:
example.cpp
<source>(14): error C2131: expression did not evaluate to a constant
<source>(10): note: failure was caused by call of undefined function or one not
declared 'constexpr'
<source>(10): note: see usage of 'S::~S'