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From: "johelegp at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/99141] New: Name of deduced type unchecked in deduction guide
Date: Wed, 17 Feb 2021 19:11:00 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99141

            Bug ID: 99141
           Summary: Name of deduced type unchecked in deduction guide
           Product: gcc
           Version: 11.0
               URL: https://godbolt.org/z/bEhjsc
            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: ---

Context
(https://timsong-cpp.github.io/cppwp/n4861/temp.deduct.guide#nt:deduction-g=
uide):
> deduction-guide:
>	explicit-specifieropt template-name ( parameter-declaration-clause ) -> s=
imple-template-id ;
The requirement
(https://timsong-cpp.github.io/cppwp/n4861/temp.deduct.guide#3.sentence-3):
> The template-name shall be the same identifier as the template-name of th=
e simple-template-id.
See https://godbolt.org/z/bEhjsc.
```C++
template<class>struct A;
template<class>using B=3DA<int>;
A(int)->B<int>;
```=