1 files changed, 13 insertions, 0 deletions
diff --git a/ext/psych/lib/psych/core_ext.rb b/ext/psych/lib/psych/core_ext.rb
index 9c55c707a1..8d3e8fb7b6 100644
--- a/ext/psych/lib/psych/core_ext.rb
+++ b/ext/psych/lib/psych/core_ext.rb
@@ -16,6 +16,19 @@ class Object
   alias :to_yaml :psych_to_yaml
 end
 
+class Module
+  def psych_yaml_as url
+    return if caller[0].end_with?('rubytypes.rb')
+    if $VERBOSE
+      warn "#{caller[0]}: yaml_as is deprecated, please use yaml_tag"
+    end
+    Psych.add_tag(url, self)
+  end
+
+  remove_method :yaml_as rescue nil
+  alias :yaml_as :psych_yaml_as
+end
+
 module Kernel
   def psych_y *objects
     puts Psych.dump_stream(*objects)