Intel® Fortran Compiler 18.0 Developer Guide and Reference
Fortran 90 identified some FORTRAN 77 features to be obsolescent. Fortran 95 and Fortran 2003 deleted some Fortran 90 features, and identified some Fortran 90 language features to be obsolescent.
Fortran 2008 has also identified some earlier standard language 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.
Intel® Fortran fully supports features identified as deleted from or obsolescent in the Fortran Standard.