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From: "johelegp at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug d/96229] New: Invalid specialization accepted when also
 constrained in base template template parameter
Date: Fri, 17 Jul 2020 01:41:55 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: d
X-Bugzilla-Version: 10.1.0
X-Bugzilla-Keywords: accepts-invalid
X-Bugzilla-Severity: normal
X-Bugzilla-Who: johelegp at gmail dot com
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: ibuclaw at gdcproject dot org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96229

            Bug ID: 96229
           Summary: Invalid specialization accepted when also constrained
                    in base template template parameter
           Product: gcc
           Version: 10.1.0
               URL: https://godbolt.org/z/W1zh9n
            Status: UNCONFIRMED
          Keywords: accepts-invalid
          Severity: normal
          Priority: P3
         Component: d
          Assignee: ibuclaw at gdcproject dot org
          Reporter: johelegp at gmail dot com
  Target Milestone: ---

See https://godbolt.org/z/W1zh9n.
```C++
template <class T> concept Int =3D requires { T{0}; };
template <template <Int> class T> struct X        { };
template <Int>   /* ^~~ */        struct Y : X<Y> { };
                                  struct Z        { };
void f() { Y<Z> x; }
```=