https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64980
--- Comment #20 from Bernd Edlinger <bernd.edlinger at hotmail dot de> --- (In reply to Dominique d'Humieres from comment #12) > In addition Bernd's patch fixes/hides the ICE for pr61960. this pr is fixed by this hunk alone: --- gcc/fortran/trans-expr.c (revision 220662) +++ gcc/fortran/trans-expr.c (working copy) @@ -3783,10 +3783,6 @@ gfc_apply_interface_mapping_to_expr (gfc_interface expr->symtree = sym->new_sym; else if (sym->expr) gfc_replace_expr (expr, gfc_copy_expr (sym->expr)); - /* Replace base type for polymorphic arguments. */ - if (expr->ref && expr->ref->type == REF_COMPONENT - && sym->expr && sym->expr->ts.type == BT_CLASS) - expr->ref->u.c.sym = sym->expr->ts.u.derived; } /* ...and to subexpressions in expr->value. */ I verified the generated code, not only the ICE is gone, but the code seems work. So I'd declare pr61960 to be a duplicate of this PR.