From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 85A993858403; Thu, 25 Nov 2021 00:37:43 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 85A993858403 From: "johelegp at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/100687] [modules, concepts] imported concept gives different result Date: Thu, 25 Nov 2021 00:37:43 +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: 12.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: johelegp 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: cc Message-ID: In-Reply-To: References: 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 X-BeenThere: gcc-bugs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-bugs mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Nov 2021 00:37:43 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100687 Johel Ernesto Guerrero Pe=C3=B1a changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |johelegp at gmail dot com --- Comment #1 from Johel Ernesto Guerrero Pe=C3=B1a --- I happened upon the same bug when changing a trait to be specialized direct= ly through the variable template rather than a class template. In my case, I asserted through the variable template, so I can confirm that it's solely a= bug with modules and not with concepts. See https://godbolt.org/z/jPT9T6ovP. mod.cpp: ```C++ export module mod; export template< class T > inline constexpr bool probe =3D false; // template< class R, class C > inline constexpr bool probe =3D true; struct S { int f( ); }; using mf_t =3D decltype( &S::f ); static_assert( probe< mf_t > ); ``` test.cpp: ```C++ import mod; struct S { int f( ); }; using mf_t =3D decltype( &S::f ); static_assert( probe< mf_t > ); ``` Output: ``` test.cpp:6:16: error: static assertion failed 6 | static_assert( probe< mf_t > ); | ^~~~~~~~~~~~~ ```=