hash literal deduplicates like Hash#[]=

From: Eric Wong <e@80x24.org>

* hash.c (rb_hash_key_str): new function
  (hash_aset_str): use rb_hash_key_str
* internal.h: add rb_hash_key_str
* st.c (st_stringify): use rb_hash_key_str
* test/ruby/test_hash.rb (test_NEWHASH_fstring_key): dynamic key
  [ruby-core:84554] [Feature #14258]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61514 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 2 deletions

diff --git a/st.c b/st.c
index 048e8a22dc..5ca6263db0 100644
--- a/st.c
+++ b/st.c
@@ -2114,8 +2114,8 @@ st_rehash(st_table *tab)
 static st_data_t
 st_stringify(VALUE key)
 {
-    return (rb_obj_class(key) == rb_cString) ?
-        rb_str_new_frozen(key) : key;
+    return (rb_obj_class(key) == rb_cString && !RB_OBJ_FROZEN(key)) ?
+        rb_hash_key_str(key) : key;
 }
 
 static void