makeing the method of the compiler more or less private

in preparation for using the same code for bocks

lib/vool/send_statement.rb

@@ -72,7 +72,7 @@ module Vool
     # - Setting up the next message, with receiver, arguments, and (importantly) return address
     # - a CachedCall , or a SimpleCall, depending on wether the receiver type can be determined
     def to_mom( compiler )
-      @receiver = SelfExpression.new(compiler.method.self_type) if @receiver.is_a?(SelfExpression)
+      @receiver = SelfExpression.new(compiler.resolve_type(:receiver)) if @receiver.is_a?(SelfExpression)
       if(@receiver.ct_type)
         simple_call(compiler)
       else