https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71799
--- Comment #1 from kargl at gcc dot gnu.org ---
Index: resolve.c
===================================================================
--- resolve.c (revision 237855)
+++ resolve.c (working copy)
@@ -6515,15 +6515,15 @@ gfc_resolve_iterator (gfc_iterator *iter
/* Convert start, end, and step to the same type as var. */
if (iter->start->ts.kind != iter->var->ts.kind
|| iter->start->ts.type != iter->var->ts.type)
- gfc_convert_type (iter->start, &iter->var->ts, 2);
+ gfc_convert_type (iter->start, &iter->var->ts, 1);
if (iter->end->ts.kind != iter->var->ts.kind
|| iter->end->ts.type != iter->var->ts.type)
- gfc_convert_type (iter->end, &iter->var->ts, 2);
+ gfc_convert_type (iter->end, &iter->var->ts, 1);
if (iter->step->ts.kind != iter->var->ts.kind
|| iter->step->ts.type != iter->var->ts.type)
- gfc_convert_type (iter->step, &iter->var->ts, 2);
+ gfc_convert_type (iter->step, &iter->var->ts, 1);
if (iter->start->expr_type == EXPR_CONSTANT
&& iter->end->expr_type == EXPR_CONSTANT
