https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61527
janus at gcc dot gnu.org changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |janus at gcc dot gnu.org --- Comment #6 from janus at gcc dot gnu.org --- (In reply to Tobias Burnus from comment #3) > It seems to be due to the following code in interface.c, which was added for > PR57530 in r201329: Reverting this part of the patch ... Index: gcc/fortran/interface.c =================================================================== --- gcc/fortran/interface.c (Revision 219753) +++ gcc/fortran/interface.c (Arbeitskopie) @@ -515,12 +515,6 @@ if (s2->attr.ext_attr & (1 << EXT_ATTR_NO_ARG_CHECK)) return 1; - /* TYPE and CLASS of the same declared type are type compatible, - but have different characteristics. */ - if ((s1->ts.type == BT_CLASS && s2->ts.type == BT_DERIVED) - || (s1->ts.type == BT_DERIVED && s2->ts.type == BT_CLASS)) - return 0; - return gfc_compare_types (&s1->ts, &s2->ts) || s2->ts.type == BT_ASSUMED; } ... indeed brings back the expected error message for comment 0. However, it causes a few testsuite regressions: FAIL: gfortran.dg/dummy_procedure_4.f90 -O (test for errors, line 28) FAIL: gfortran.dg/proc_ptr_30.f90 -O (test for errors, line 25) FAIL: gfortran.dg/proc_ptr_comp_32.f90 -O (test for errors, line 34) FAIL: gfortran.dg/proc_ptr_comp_33.f90 -O (test for errors, line 14) FAIL: gfortran.dg/proc_ptr_comp_33.f90 -O (test for errors, line 54)