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-rw-r--r--string.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/string.c b/string.c
index 01316b9c23..26d1cbf2af 100644
--- a/string.c
+++ b/string.c
@@ -517,8 +517,11 @@ rb_str_dup_frozen(str)
VALUE str;
{
if (FL_TEST(str, ELTS_SHARED)) {
- OBJ_FREEZE(RSTRING(str)->aux.shared);
- return RSTRING(str)->aux.shared;
+ VALUE shared = RSTRING(str)->aux.shared;
+ if (RSTRING(shared)->len == RSTRING(str)->len) {
+ OBJ_FREEZE(shared);
+ return shared;
+ }
}
if (OBJ_FROZEN(str)) return str;
str = rb_str_dup(str);