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 014163858C31; Mon, 10 Jul 2023 05:53:42 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 014163858C31
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1688968423;
	bh=T90Oe29bV9L3R4b8aTsLgx9T702+syb8/OO3lpemEGk=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=dSqk35zo5DWnOXHMc6SwWiAwMm+HdgdVo0RG8VwqF2QWXficN7owoJl7ZHuOSMgSu
	 6VkmXwQKkdqnUV0D2zMM0m7ZivNh2Mn7n22RHsnYqu3CXjqshT7Gto7pLngKYd9yVK
	 N0Bi9y11TErpOHmBKP9JTWFwXzvv0YUtH1AAE7Lw=
From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/110580] [14 Regression] gcc fails to typecheck nix-2.16.1
 source: error: invalid initialization of reference of type
Date: Mon, 10 Jul 2023 05:53:42 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: accepts-invalid, needs-bisection, rejects-valid,
 wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: pinskia at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 14.0
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: keywords
Message-ID: <bug-110580-4-wXbtVC5NPN@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-110580-4@http.gcc.gnu.org/bugzilla/>
References: <bug-110580-4@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=3D110580

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |accepts-invalid

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
yes my theory is correct and becomes obvious with the error message for:
```

struct s0 {};
struct s1 {};
struct s2 {};
template <typename T>
struct t;
template <typename _Key>=20
struct s3 {
  template <typename _Up, typename _Vp =3D _Up>
  static constexpr bool __usable_key =3D t<_Vp>::v;
  static_assert(__usable_key<s0>);
  static_assert(__usable_key<s1>);
};
s3<s2> t2;
```
Error message:
```
<source>: In instantiation of 'constexpr const bool s3<s2>::__usable_key<s0,
s2>':
...
<source>: In instantiation of 'constexpr const bool s3<s2>::__usable_key<s1,
s2>':
```
s2 there is definitely incorrect=