* ext/psych/lib/psych/visitors/to_ruby.rb: correctly register

self-referential strings. Fixes tenderlove/psych #135

* test/psych/test_string.rb: appropriate test.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40137 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/psych/test_string.rb

@@ -15,6 +15,31 @@ module Psych
       end
     end
 
+    def test_string_subclass_with_anchor
+      y = Psych.load <<-eoyml
+---
+body:
+  string: &70121654388580 !ruby/string
+    str: ! 'foo'
+  x:
+    body: *70121654388580
+      eoyml
+      assert_equal({"body"=>{"string"=>"foo", "x"=>{"body"=>"foo"}}}, y)
+    end
+
+    def test_self_referential_string
+      y = Psych.load <<-eoyml
+---
+string: &70121654388580 !ruby/string
+  str: ! 'foo'
+  body: *70121654388580
+      eoyml
+
+      assert_equal({"string"=>"foo"}, y)
+      value = y['string']
+      assert_equal value, value.instance_variable_get(:@body)
+    end
+
     def test_another_subclass_with_attributes
       y = Psych.load Psych.dump Y.new("foo").tap {|y| y.val = 1}
       assert_equal "foo", y