* ext/syck/emitter.c (syck_emit_seq, syck_emit_map, syck_emit_item):

  should output complex key mark even if map's key is empty seq/map.
  [ruby-core:7129]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@9835 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 19 insertions, 0 deletions

diff --git a/test/yaml/test_yaml.rb b/test/yaml/test_yaml.rb
index 78a0877300..676310e6fc 100644
--- a/test/yaml/test_yaml.rb
+++ b/test/yaml/test_yaml.rb
@@ -1253,6 +1253,25 @@ EOY
       assert_cycle(NumericTest.new(3)) # Subclass of Numeric
     end
 
+    #
+    # Test empty map/seq in map cycle
+    #
+    def test_empty_map_key
+      #
+      # empty seq as key
+      #
+      o = YAML.load({[]=>""}.to_yaml)
+      assert_equal(Hash, o.class)
+      assert_equal([[]], o.keys)
+
+      #
+      # empty map as key
+      #
+      o = YAML.load({{}=>""}.to_yaml)
+      assert_equal(Hash, o.class)
+      assert_equal([{}], o.keys)
+    end
+
 end
 
 if $0 == __FILE__