[Bug fortran/79840] New: Inconsistent exclamation mark in diagnostic

["roland.illig at gmx dot de" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79840

            Bug ID: 79840
           Summary: Inconsistent exclamation mark in diagnostic
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: roland.illig at gmx dot de
  Target Milestone: ---

from fortran/module.c:

gfc_fatal_error ("Can't USE the same %smodule we're building!", ...);

This diagnostic uses an exclamation mark, as opposed to all the others that
don't use any punctuation at all. It also talks about "we", which is different
from all other diagnostics.

The diagnostic should follow the same pattern as all the other ones.