[Bug c/57021] New: Better error message for * missing an expression or rather using a non-type as a cast

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57021

             Bug #: 57021
           Summary: Better error message for * missing an expression or
                    rather using a non-type as a cast
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: pinskia@gcc.gnu.org


Take:
int main(void)
{
  int a;
  (a*)0;
}
---- CUT ---
Right now we produce:
t.c:4:6: error: expected expression before ‘)’ token
   (a*)0;
      ^
or for C++:
t.c:4:6: error: expected primary-expression before ‘)’ token
   (a*)0;
      ^
t.c:4:7: error: expected ‘;’ before numeric constant
   (a*)0;
       ^
---- CUT ----
Really we should say instead a is not a type.  Yes this is a complex error
recovery issue but I think we should be able to figure it out.