diff options
Diffstat (limited to 'src/string.c')
| -rw-r--r-- | src/string.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/string.c b/src/string.c index e4bfd034c..5cca6d460 100644 --- a/src/string.c +++ b/src/string.c @@ -2615,6 +2615,9 @@ mrb_str_cat_cstr(mrb_state *mrb, mrb_value str, const char *ptr) MRB_API mrb_value mrb_str_cat_str(mrb_state *mrb, mrb_value str, mrb_value str2) { + if (mrb_str_ptr(str) == mrb_str_ptr(str2)) { + mrb_str_modify(mrb, mrb_str_ptr(str)); + } return mrb_str_cat(mrb, str, RSTRING_PTR(str2), RSTRING_LEN(str2)); } |