#156 Remove arguments on clear

lib/rake/task.rb

@@ -141,11 +141,12 @@ def reenable
       @already_invoked = false
     end
 
-    # Clear the existing prerequisites and actions of a rake task.
+    # Clear the existing prerequisites, actions, comments, and arguments of a rake task.
     def clear
       clear_prerequisites
       clear_actions
       clear_comments
+      clear_args
       self
     end
 
@@ -167,6 +168,12 @@ def clear_comments
       self
     end
 
+    # Clear the existing arguments on a rake task.
+    def clear_args
+      @arg_names = nil
+      self
+    end
+
     # Invoke the task if it is needed.  Prerequisites are invoked first.
     def invoke(*args)
       task_args = TaskArguments.new(arg_names, args)

test/test_rake_task.rb

@@ -112,11 +112,12 @@ def test_can_double_invoke_with_reenable
 
   def test_clear
     desc "a task"
-    t = task("t" => "a") { }
+    t = task("t", ["b"] => "a") { }
     t.clear
     assert t.prerequisites.empty?, "prerequisites should be empty"
     assert t.actions.empty?, "actions should be empty"
     assert_nil t.comment, "comments should be empty"
+    assert_empty t.arg_names, "arg names should be empty"
   end
 
   def test_clear_prerequisites
@@ -148,6 +149,18 @@ def test_clear_comments
     assert_equal 1, task(:foo).actions.size
   end
 
+  def test_clear_args
+    task :foo, [:x] do
+      # Dummy action
+    end
+
+    task(:foo).clear_args
+
+    task :foo
+
+    assert_empty task(:foo).arg_names
+  end
+
   def test_find
     task :tfind
     assert_equal "tfind", Task[:tfind].name