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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/103879] error: accessing value of
 variant::_Copy_ctor_base through a 'const variant<string>' glvalue in a
 constant expression
Date: Fri, 31 Dec 2021 22:10:47 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103879

--- 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'=