Accept Pathname object as rule's prerequisite

Author: gemmaro

lib/rake/task_manager.rb

@@ -302,18 +302,16 @@ def make_sources(task_name, task_pattern, extensions)
           source == ext ? task_name.ext(ext) : source
         when String, Symbol
           ext.to_s
+        when Pathname
+          Rake.from_pathname(ext)
         when Proc, Method
           if ext.arity == 1
             ext.call(task_name)
           else
             ext.call
           end
         else
-          if (ext = Rake.from_pathname(ext)).is_a?(String)
-            ext
-          else
-            fail "Don't know how to handle rule dependent: #{ext.inspect}"
-          end
+          fail "Don't know how to handle rule dependent: #{ext.inspect}"
         end
       }
       result.flatten