add pretty_print

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@5697 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/drb/drb.rb

@@ -1030,6 +1030,17 @@ module DRb
 	raise result
       end
     end
+
+    def pretty_print(q)   # :nodoc:
+      q.pp_object(self)
+    end
+
+    def pretty_print_cycle(q)   # :nodoc:
+      q.object_address_group(self) {
+        q.breakable
+        q.text '...'
+      }
+    end
   end
 
   # Class handling the connection between a DRbObject and the