[Bug c++/100741] New: [enhancement] Should show better error message if using ‘typedef’ instead of ‘using’.

[cyp561 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100741

            Bug ID: 100741
           Summary: [enhancement] Should show better error message if
                    using ‘typedef’ instead of ‘using’.
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: cyp561 at gmail dot com
  Target Milestone: ---

Test code:
  typedef Rng = std::mt19937_64;

Actual error message:
  error: ‘Rng’ does not name a type

Useful error message:
  error: Used ‘typedef’ with ‘using’ syntax
   11 | typedef Rng = std::mt19937_64;
        ^~~~~~~
        using