class X

	sig BindMethod

	var _command as BindMethod

	cue init(command as BindMethod)
		base.init
		_command = ref command       # .error. Only methods can be referenced, not parameters.

		x = X()
		_command = ref x.foo  # .error. Cannot find a definition for "foo"

		bad = BadClassName()  # .error. Cannot find "BadClassName".
		_command = ref bad.method  # use to throw exception in compiler