fix the plus method that sneaked into arm

test/compiler/test_hello.rb

@@ -4,6 +4,8 @@ class HelloTest < MiniTest::Test
 
   def check
     machine = Virtual.machine.boot
+    Parfait::Space.object_space.get_class_by_name(:Integer).remove_instance_method :plus
+    #TODO remove this hack: write proper aliases
     expressions = machine.compile_main @string_input
     output_at = "Register::CallImplementation"
     #{}"Register::CallImplementation"