[Bug c++/104093] New: Make -Wvexing-parse warn on declaration of void functions as well

[doodspav at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104093

            Bug ID: 104093
           Summary: Make -Wvexing-parse warn on declaration of void
                    functions as well
           Product: gcc
           Version: 11.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: doodspav at gmail dot com
  Target Milestone: ---

Right now G++ with -Wvexing-parse will warn about this:

void fn() {
   int x();
}

but not this:

void fn() {
   void x();
}

While the former is much more likely to occur than the latter, I have seen the
latter happen in practice and it would be nice for the warning to cover this
too.