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From: "markus-t314 at gmx dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/109083] New: Incorrect static_assert shown in diagnostics
Date: Thu, 09 Mar 2023 19:23:50 +0000
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X-Bugzilla-Component: c++
X-Bugzilla-Version: 12.2.1
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109083

            Bug ID: 109083
           Summary: Incorrect static_assert shown in diagnostics
           Product: gcc
           Version: 12.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: markus-t314 at gmx dot de
  Target Milestone: ---

Code:

#include <type_traits>

template<typename T>
void unused_function()
{
    static_assert(std::is_member_function_pointer<decltype(&T::foo)>::value,
"Line 6");
}

template<typename T>
void fail_here()
{
    static_assert(std::is_member_function_pointer<decltype(&T::foo)>::value,
"Line 12");
}

int main()
{
    fail_here<int>();
}



This fails correctly, but the wrong static assertion is given in diagnostic=
s:

main.cpp: In instantiation of =E2=80=98void fail_here() [with T =3D int]=E2=
=80=99:
main.cpp:17:19:   required from here
main.cpp:6:60: error: =E2=80=98foo=E2=80=99 is not a member of =E2=80=98int=
=E2=80=99
    6 |=20=20=20=20
static_assert(std::is_member_function_pointer<decltype(&T::foo)>::value, "L=
ine
6");
      |


https://godbolt.org/z/6Yrc9x6Ws


Might be related to bug 66968=