return compiler, not generated mom

does make the tests more verbose, but the code cleaner

lib/parfait/vool_method.rb

@@ -28,17 +28,12 @@ module Parfait
       type.create_method( @name , @args_type , @frame_type)
     end
 
-    def compile_to_mom(for_type)
+    def compiler_for(for_type)
-      typed_method = create_typed_method(for_type)
-      source.to_mom( typed_method )
-    end
-
-    def compile_to_risc(for_type)
       typed_method = create_typed_method(for_type)
       head = source.to_mom( typed_method )
       compiler = Risc::MethodCompiler.new( typed_method )
       compiler.add_mom(head)
-      head # return for testing
+      compiler
     end
   end
 end

lib/risc/platform.rb

@@ -23,7 +23,7 @@ module Risc
       when "Interpreter"
         return Risc::InterpreterPlatform.new
       else
-        raise "not recignized platform #{name}"
+        raise "not recognized platform #{name.class}:#{name}"
       end
     end
   end

lib/vool/method_statement.rb

@@ -11,7 +11,7 @@ module Vool
     def to_mom(clazz)
       @clazz = clazz || raise( "no class in #{self}")
       method = @clazz.add_method_for(name , make_arg_type , make_frame , body )
-      method.compile_to_risc(clazz.instance_type)
+      method.compiler_for(clazz.instance_type)
     end
 
     def each(&block)