lib/memoist.rb in memoist-0.9.1 vs lib/memoist.rb in memoist-0.9.2

@@ -94,11 +94,11 @@
 
       Memoist.memoist_eval(self) do
         include InstanceMethods
 
         if method_defined?(unmemoized_method)
-          raise "Already memoized #{method_name}"
+          raise AlreadyMemoizedError.new("Already memoized #{method_name}")
         end
         alias_method unmemoized_method, method_name
 
         if instance_method(method_name).arity == 0
 
@@ -192,6 +192,8 @@
           protected method_name
         end
       end
     end
   end
+
+  class AlreadyMemoizedError < RuntimeError; end
 end