diff options
| -rw-r--r-- | src/variable.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/variable.c b/src/variable.c index 45dc055af..390da5455 100644 --- a/src/variable.c +++ b/src/variable.c @@ -489,6 +489,9 @@ mrb_obj_iv_set(mrb_state *mrb, struct RObject *obj, mrb_sym sym, mrb_value v) { iv_tbl *t = obj->iv; + if (MRB_FROZEN_P(obj)) { + mrb_raisef(mrb, E_RUNTIME_ERROR, "can't modify frozen %S", mrb_obj_value(obj)); + } if (!t) { t = obj->iv = iv_new(mrb); } |