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From: "antoshkka at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/98767] New: Function signature lost in concept diagnostic
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Date: Wed, 20 Jan 2021 13:31:54 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98767

            Bug ID: 98767
           Summary: Function signature lost in concept diagnostic message
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: antoshkka at gmail dot com
  Target Milestone: ---

Consider the example:


template <typename Function, typename T>
concept Callable1Arg =3D requires(Function func, T value) {
    func(value);
};

// Should fail and fails:
static_assert(Callable1Arg<int(*)(int*), bool>);


The diagnotics has the following line:
"in requirements with 'Function func', 'T value' [with T =3D bool; Function=
 =3D int
(*)()]"

However the type of the Function is "int (*)(int*)" not "int (*)()"


Godbolt playground: https://godbolt.org/z/afKqq5=