* ext/json/ext/parser/parse.c: use ruby_xfree().

* ext/json/ext/parser/parse.rl: ditto.

* ext/json/ext/parser/unicode.c: ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@19438 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/json/lib/json/add/core.rb

@@ -96,7 +96,7 @@ class Struct
 
   def to_json(*args)
     klass = self.class.name
-    klass.to_s.empty? and raise JSON::JSONError, "Only named structs are supported!"
+    klass.nil? and raise JSON::JSONError, "Only named structs are supported!"
     {
       'json_class' => klass,
       'v'     => values,