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 CONTAINS SUBROUTINE S1(F) INTERFACE FUNCTION F() INTEGER F END FUNCTION F END INTERFACE END SUBROUTINE S1 END MODULE M1 USE M1 INTEGER :: I I=1 CALL S1(I) 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=25098