From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
	id A37303861894; Thu,  5 Oct 2023 12:40:10 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org A37303861894
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1696509610;
	bh=BWQwutpK1UwMoGCAR7FF9iSzXSRtlVJS0SYOXK+9tGg=;
	h=From:To:Subject:Date:From;
	b=gMrolSPDES9hb4TF8Bl+jB82r70HSKvdBxxw+8hwl23yIr1G390CP24S7898qRwhr
	 MT8EW91ECqSkzflID1nk+OdCdZ+ekWBE7JOOWAhFQbx3LJJdrwNUBICOFmvhJcIhjx
	 bvWuWn/QMPw7paDQsebnA9VxwtHFQa9T5Q1IJAUQ=
From: "watanabemakoto.math at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/111703] New: [C++20]Compiler fails when using generic
 lambda in specific situation
Date: Thu, 05 Oct 2023 12:40:10 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 13.2.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: watanabemakoto.math at gmail dot com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status
 bug_severity priority component assigned_to reporter target_milestone
Message-ID: <bug-111703-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111703

            Bug ID: 111703
           Summary: [C++20]Compiler fails when using generic lambda in
                    specific situation
           Product: gcc
           Version: 13.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: watanabemakoto.math at gmail dot com
  Target Milestone: ---

Consider the example:

```
#include <utility>
using P =3D std::pair<int, int>;
void (*f)(P);

int main(){
    [](auto) {
        P x;
        f(x);
    };
}
```

GCC 13.2.0 fails to compile the example. Compile option is `-std=3Dc++20` .

Godbolt playground: https://godbolt.org/z/nPMb38ond=