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The problem was indeed that generating a formal from an actual arglist is a bad idea when classes are involved. Fixed in the attached patch. I think it still makes sense to remove the checks when the other attributes are present (or PR96073 may come back in different guise, even if I have to test case at present). I have also converted the test to a run-time check. gcc/fortran/ChangeLog: PR fortran/119928 * interface.cc (gfc_check_dummy_characteristics): Do not issue error if one dummy symbol has been generated from an actual argument and the other one has OPTIONAL, INTENT, ALLOCATABLE, POINTER, TARGET, VALUE, ASYNCHRONOUS or CONTIGUOUS. (gfc_get_formal_from_actual_arglist): Do nothing if symbol is a class. gcc/testsuite/ChangeLog: PR fortran/119928 * gfortran.dg/interface_60.f90: New test.
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