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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug testsuite/113366] g++.dg/cpp2a/concepts-pr67774.C FAIL
Date: Sat, 13 Jan 2024 11:32:17 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113366

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Odd.

We get the type/value mismatch from here:

        template<typename _Tp>
          using __maybe_const_t
            =3D __conditional_t<__format::__formattable_with<_Tp, _Context>,
                              const _Tp, _Tp>;


Where the boolean condition is:

  template<typename _Tp, typename _Context,
           typename _Formatter
             =3D typename _Context::template formatter_type<remove_const_t<=
_Tp>>,
           typename _ParseContext
             =3D basic_format_parse_context<typename _Context::char_type>>
    concept __formattable_with
      =3D semiregular<_Formatter>
          && requires (const _Formatter __cf, _Tp&& __t, _Context __fc)
    {
      { __cf.format(__t, __fc) } -> same_as<typename _Context::iterator>;
    };


That seems like a valid concept. Is something in the -fconcepts-ts code
tripping up?=