fixes from the method argument change

Affects
method creation
argument manipulation
compiler / to_code

lib/typed/tree/to_code.rb

@@ -25,15 +25,21 @@ module Typed
       w = Tree::FunctionStatement.new()
       w.return_type = return_type
       w.name = name.children.first
-      w.parameters = parameters.to_a.collect do |p|
-        raise "error, argument must be a identifier, not #{p}" unless p.type == :parameter
-        p.children
-      end
+      w.parameters = process parameters
       w.statements = process(statements)
       w.receiver = receiver
       w
     end
 
+    def on_parameters statement
+      params = {}
+      statement.children.each do |param , type , name|
+        type , name = *param
+        params[name] = type
+      end
+      params
+    end
+
     def on_field_def statement
       type , name , value = *statement
       w = Tree::FieldDef.new()