* hash.c (initialize_copy): duping should rehash the hash.

* test/ruby/test_hash.rb: added a test to ensure rehash.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37248 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 1 deletions

diff --git a/hash.c b/hash.c
index 5172e13b57..bf9dbd5467 100644
--- a/hash.c
+++ b/hash.c
@@ -1187,8 +1187,11 @@ rb_hash_initialize_copy(VALUE hash, VALUE hash2)
 {
     Check_Type(hash2, T_HASH);
 
-    if (!RHASH_EMPTY_P(hash2))
+    if (!RHASH_EMPTY_P(hash2)) {
         RHASH(hash)->ntbl = st_copy(RHASH(hash2)->ntbl);
+	rb_hash_rehash(hash);
+    }
+
     if (FL_TEST(hash2, HASH_PROC_DEFAULT)) {
         FL_SET(hash, HASH_PROC_DEFAULT);
     }