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From: "hewillk at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/105583] New: Syntax error when alias template in
 requires-clause
Date: Thu, 12 May 2022 13:16:25 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105583

            Bug ID: 105583
           Summary: Syntax error when alias template in requires-clause
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hewillk at gmail dot com
  Target Milestone: ---

template<class>
constexpr bool v =3D true;

template<class>
using A =3D decltype([] { return 0; }());

template<class T>
using B =3D decltype([] {
  if (requires { v<A<T>&>; }) { }
}());

https://godbolt.org/z/WseWqKMcG

gcc rejects the above legal syntax.=