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From: "johelegp at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/102137] New: class template argument deduction with
 template template parameter allows explicit deduction guide
Date: Mon, 30 Aug 2021 23:40:48 +0000
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X-Bugzilla-Version: 12.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102137

            Bug ID: 102137
           Summary: class template argument deduction with template
                    template parameter allows explicit deduction guide
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: accepts-invalid
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: johelegp at gmail dot com
                CC: johelegp at gmail dot com
  Target Milestone: ---

See https://godbolt.org/z/qc4e95TEK.
```C++
template<class T> struct B { B(int){} };  explicit B(int) -> B<int>;
template<template<class> class T> void f() { [[maybe_unused]] T _ =3D 0; }
void g() { f<B>(); }
```=