--- private_method_defined?(name)
--- protected_method_defined?(name)
--- public_method_defined?(name)

    ruby 1.7 feature

    줾졢private, protected,
    public Ǥ륤󥹥󥹥᥽å name ⥸塼
    ƤȤ֤ޤname  Symbol 
    ʸǤ

    Module#method_defined? [Module/method_defined?]
    ⻲ȤƤ

