* ext/psych/lib/psych/visitors/yaml_tree.rb: keep a reference to

  custom coders so that GC does not impact dumped yaml reference ids.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35655 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Wed May 16 01:15:45 2012  Aaron Patterson <aaron@tenderlovemaking.com>
+
+	* ext/psych/lib/psych/visitors/yaml_tree.rb: keep a reference to
+	  custom coders so that GC does not impact dumped yaml reference ids.
+
 Tue May 15 23:59:48 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* lib/test/unit.rb (Test::Unit::Options#setup_options): add --color option.

ext/psych/lib/psych/visitors/yaml_tree.rb

@@ -20,6 +20,7 @@ def initialize options = {}, emitter = TreeBuilder.new, ss = ScalarScanner.new
         @st       = {}
         @ss       = ss
         @options  = options
+        @coders   = []
 
         @dispatch_cache = Hash.new do |h,klass|
           method = "visit_#{(klass.name || '').split('::').join('_')}"
@@ -406,6 +407,7 @@ def register target, yaml_obj
       end
 
       def dump_coder o
+        @coders << o
         tag = Psych.dump_tags[o.class]
         unless tag
           klass = o.class == Object ? nil : o.class.name