是否有任何源代码分析工具检测Ruby中未使用的参数？

我知道的选项包括

>严格掌握TDD.
> Heckle(由于ParseTree问题,目前仅适用于Ruby 1.8)
>使用诸如RubyMine之类的IDE来检测未使用的参数或自动化重构.

但是,是否有任何源代码分析工具或警告选项可以检测未使用的参数？

背景：我正在做一些重构.我改变了(代码稍微简化)：

# Not within the Foo class (therefore can't be as easily accessed by unit testing)
# and in addition,the name of the configuration file is hard-wired
def parse_configuration
  raw_configuration = YAML.load_file("configuration.yml")
  # Do stuff with raw_configuration to produce configuration_options_for_foo
  return configuration_options_for_foo
end

if __FILE__ == $0
  configuration_options_for_foo = parse_configuration
  foo = Foo.new(configuration_options_for_foo)
end

至

class Foo
  # Now unit tests can call Foo.new_using_yaml("configuration.yml")
  # or use "test_configuration.yml"
  def self.new_using_yaml(yaml_filename)
    # Where I went wrong,forgetting to replace "configuration.yml" with yaml_filename
    raw_configuration = YAML.load_file("configuration.yml")
    # Do stuff with raw_configuration to produce configuration_options_for_foo
    new(configuration_options_for_foo)
  end
end

if __FILE__ == $0
  foo = Foo.new_using_yaml("configuration.yml")
end