This commit was manufactured by cvs2svn to create tag 'v1_6_4'.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v1_6_4@1498 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/observer.rb b/lib/observer.rb
index 08e75f5125..e1b249e885 100644
--- a/lib/observer.rb
+++ b/lib/observer.rb
@@ -5,7 +5,7 @@
 module Observable
   def add_observer(observer)
     @observer_peers = [] unless defined? @observer_peers
-    unless defined? observer.update
+    unless observer.respond_to? :update
       raise NameError, "observer needs to respond to `update'" 
     end
     @observer_peers.push observer