nobu	2016-03-09 16:17:02 +0900 (Wed, 09 Mar 2016)

  New Revision: 54056

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=54056

  Log:
    hash.c: hash_dup for rb_hash_to_h
    
    * hash.c (rb_hash_to_h): share hash_dup to copy the contents and
      the default value/proc only.

  Modified files:
    trunk/hash.c
Index: hash.c
===================================================================
--- hash.c	(revision 54055)
+++ hash.c	(revision 54056)
@@ -1881,14 +1881,8 @@ static VALUE https://github.com/ruby/ruby/blob/trunk/hash.c#L1881
 rb_hash_to_h(VALUE hash)
 {
     if (rb_obj_class(hash) != rb_cHash) {
-	VALUE ret = rb_hash_new();
-	if (!RHASH_EMPTY_P(hash))
-	    RHASH(ret)->ntbl = st_copy(RHASH(hash)->ntbl);
-	if (FL_TEST(hash, HASH_PROC_DEFAULT)) {
-	    FL_SET(ret, HASH_PROC_DEFAULT);
-	}
-	RHASH_SET_IFNONE(ret, RHASH_IFNONE(hash));
-	return ret;
+	const VALUE flags = RBASIC(hash)->flags;
+	hash = hash_dup(hash, rb_cHash, flags & HASH_PROC_DEFAULT);
     }
     return hash;
 }

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