base/ImmutableStack.rb in maroon-0.6.5 vs base/ImmutableStack.rb in maroon-0.7.0

@@ -1,30 +1,32 @@
 context :ImmutableStack do
   role :head do
   end
   role :tail do
   end
-  pop do
+
+  def pop
     [@head, @tail]
   end
-  push do |element|
+
+  def push(element)
     ImmutableStack.new element, self
   end
 
-  empty self do
+  def self.empty
     @@empty ||= self.new(nil, nil)
   end
 
-  each do
+  def each
     yield head
     t = tail
     while t != ImmutableStack::empty do
       h, t = t.pop
       yield h
     end
   end
 
-  initialize do |h, t|
+  def initialize(h, t)
     @head = h
     @tail = t
     self.freeze
   end
 end