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From: "jlame646 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/107605] GCC rejects valid program involving requires-clause
Date: Thu, 10 Nov 2022 12:50:03 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107605

Jason Liam <jlame646 at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|GCC rejects valid program   |GCC rejects valid program
                   |involving std::bind and     |involving requires-clause
                   |requires                    |

--- Comment #2 from Jason Liam <jlame646 at gmail dot com> ---
(In reply to Jonathan Wakely from comment #1)
> This has nothing to do with std::bind.
>=20


Yes i know this has nothing to do with `std::bind`. For example, I created =
the
following demo that reproduces the same error without std::bind. See demo:
https://godbolt.org/z/K6jKqsGx5  . I also mentioned the same in one of my
comments here:
https://stackoverflow.com/questions/74385849/clang-accepts-program-involvin=
g-requires-constraint-while-gcc-and-msvc-rejects-i/74386905#comment13131927=
8_74385849
.  I've edited the title of this bug.

```
template <typename T>=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
class myclass {=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
public:=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20

  void func(const T&) requires true
  {
     std::cout << "true";
  }

  void func(const T&) requires false
  {
     std::cout << "false";
  }
};=20=20=20=20=20=20
template<typename T>=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
void bar(T&& )
{

}

int main(){=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20

  myclass<int> obj;=20
  bar(&myclass<int>::func); //accepted by clang but rejected by gcc and msv=
c=20=20=20=20

}=20=20
```=