vm.c (mrb_ci_kdict): should return `-1` when no kargs given; ref
MODIFY
src/vm.c
src/vm.c
@@ -482,6 +482,7 @@ mrb_funcall_id(mrb_state *mrb, mrb_value self, mrb_sym mid, mrb_int argc, ...)
static mrb_int
mrb_ci_kidx(const mrb_callinfo *ci)
{
+ if (ci->nk == 0) return -1;
return (ci->n == CALL_MAXARGS) ? 2 : ci->n + 1;
}

vm.c (mrb_ci_kdict): should return `-1` when no kargs given; ref #5741