diff options
| -rw-r--r-- | src/hash.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/src/hash.c b/src/hash.c index 0bda2b48b..ffb8bd931 100644 --- a/src/hash.c +++ b/src/hash.c @@ -104,10 +104,11 @@ static void mrb_hash_modify(mrb_state *mrb, mrb_value hash); static inline mrb_value mrb_hash_ht_key(mrb_state *mrb, mrb_value key) { - if (mrb_string_p(key)) - return mrb_str_dup(mrb, key); - else - return key; + if (mrb_string_p(key) && !RSTR_FROZEN_P(mrb_str_ptr(key))) { + key = mrb_str_dup(mrb, key); + RSTR_SET_FROZEN_FLAG(mrb_str_ptr(key)); + } + return key; } #define KEY(key) mrb_hash_ht_key(mrb, key) |