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From: "fchelnokov at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/114654] New: Alias template cannot be found
Date: Tue, 09 Apr 2024 10:53:48 +0000
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X-Bugzilla-Version: 13.2.1
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114654

            Bug ID: 114654
           Summary: Alias template cannot be found
           Product: gcc
           Version: 13.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: fchelnokov at gmail dot com
  Target Milestone: ---

This program

```
template <auto L, auto L2>
struct S {};

template<auto L>
using A =3D S<L, []{}>;

template<typename I>
using B =3D A<[]{}>;

using C =3D B<int>;
```

looks valid and it is accepted by Clang and MSVC, but GCC complains:
<source>:10:11: error: 'B' does not name a type
   10 | using C =3D B<int>;
Online demo: https://gcc.godbolt.org/z/P4ozcd6oW

Related discussion: https://stackoverflow.com/q/78292459/7325599=