Fortran 2003 and Fortran 95 deleted some Fortran 90 features, and identified some Fortran 90 language features to be obsolescent. Fortran 90 identified some FORTRAN 77 features to be obsolescent. Features considered obsolescent may be removed from future revisions of the Fortran Standard.
To have these features flagged, you can specify compiler option stand.
Note
Intel® Fortran fully supports features deleted from Fortran 2003 and Fortran 95.