The attached object may not be a class; fix
MODIFY
src/class.c
src/class.c
@@ -137,7 +137,15 @@ mrb_class_outer_module(mrb_state *mrb, struct RClass *c)
mrb_value klass;
klass = mrb_obj_iv_get(mrb, (struct RObject *)cls,
mrb_intern_lit(mrb, "__attached__"));
+ switch (mrb_type(klass)) {
+ case MRB_TT_CLASS:
+ case MRB_TT_SCLASS:
+ case MRB_TT_MODULE:
cls = mrb_class_ptr(klass);
+ break;
+ default:
+ break;
+ }
}
return cls;
}

The attached object may not be a class; fix #3602