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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/107605] GCC rejects valid program involving std::bind and
 requires
Date: Thu, 10 Nov 2022 12:05:34 +0000
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X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: rejects-valid
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107605

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
           Keywords|                            |rejects-valid
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2022-11-10

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This has nothing to do with std::bind.

extern "C" int puts(const char*);

template <typename T>
class myclass {
public:

  void func(const T&) requires true
  {
     puts("true");
  }

  void func(const T&) requires false
  {
     puts("false");
  }
};=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=20=
=20=20=20=20

auto mylambda =3D &myclass<int>::func;

req.C:18:32: error: unable to deduce =E2=80=98auto=E2=80=99 from =E2=80=98&=
 myclass<int>::func=E2=80=99
   18 | auto mylambda =3D &myclass<int>::func;
      |                                ^~~~
req.C:18:32: note:   couldn=E2=80=99t deduce template parameter =E2=80=98au=
to=E2=80=99


I think there's an existing bug about this.=