[Bug fortran/25077] New: better diagnostic needed

["jv244 at cam dot ac dot uk" <gcc-bugzilla at gcc dot gnu dot org>]

using GNU Fortran 95 (GCC) 4.1.0 20051126 (prerelease)  with '-g -pedantic
-std=f95', I get a bad / no diagnostic for the following invalid code:

MODULE M1
 IMPLICIT NONE
 INTERFACE ASSIGNMENT(=)
  MODULE PROCEDURE T1
 END INTERFACE
CONTAINS
 SUBROUTINE T1(I,J)
   INTEGER, INTENT(OUT)  :: I
   INTEGER, INTENT(IN)  :: J
   I=-J
 END SUBROUTINE T1
END MODULE M1

USE M1
IMPLICIT NONE
INTEGER :: I,J
I=1
J=I
write(6,*) I,J
END


-- 
           Summary: better diagnostic needed
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jv244 at cam dot ac dot uk


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25077