* hash.c (recursive_hash): hash value of emptied hash should be

equal to an empty hash.  [ruby-core:38650]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32810 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Tue Aug  2 12:03:16 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* hash.c (recursive_hash): hash value of emptied hash should be
+	  equal to an empty hash.  [ruby-core:38650]
+
 Tue Aug  2 11:42:15 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* parse.y (rb_enc_symname2_p): :! is valid symbol.  [Bug #5136]

hash.c

@@ -1685,6 +1685,7 @@ recursive_hash(VALUE hash, VALUE dummy, int recur)
     if (!RHASH(hash)->ntbl)
         return LONG2FIX(0);
     hval = RHASH(hash)->ntbl->num_entries;
+    if (!hval) return LONG2FIX(0);
     if (recur)
 	hval = rb_hash_uint(rb_hash_start(rb_hash(rb_cHash)), hval);
     else

test/ruby/test_hash.rb

@@ -809,6 +809,9 @@ class TestHash < Test::Unit::TestCase
 
   def test_hash2
     assert_kind_of(Integer, {}.hash)
+    h = {1=>2}
+    h.shift
+    assert_equal({}.hash, h.hash, '[ruby-core:38650]')
   end
 
   def test_update2