`ObjectSpace.count_objects` to support `MRB_TT_ISTRUCT`;
@@ -100,6 +100,7 @@ os_count_objects(mrb_state *mrb, mrb_value self)
COUNT_TYPE(T_ENV);
COUNT_TYPE(T_DATA);
COUNT_TYPE(T_FIBER);
+ COUNT_TYPE(T_ISTRUCT);
#undef COUNT_TYPE
default:
type = mrb_fixnum_value(i); break;
