[Bug c++/93801] New: False -Wmismatched-tags upon redundant typename

[sbergman at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93801

            Bug ID: 93801
           Summary: False -Wmismatched-tags upon redundant typename
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sbergman at redhat dot com
                CC: msebor at gcc dot gnu.org
  Target Milestone: ---

With recent GCC trunk:

> $ cat test.cc
> namespace N { struct S {}; }
> typename N::S s;
> 
> $ g++ -fsyntax-only -Wmismatched-tags test.cc
> test.cc:2:13: warning: ‘N::S’ declared with a mismatched class-key ‘class’ [-Wmismatched-tags]
>     2 | typename N::S s;
>       |             ^
> test.cc:2:13: note: remove the class-key or replace it with ‘struct’
> test.cc:1:22: note: ‘N::S’ defined as ‘struct’ here
>     1 | namespace N { struct S {}; }
>       |                      ^