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instance_methods 

        # Module.instance_methods

(from ruby core)
---
    mod.instance_methods(include_super=true)   -> array

---

Returns an array containing the names of the public and protected
instance methods in the receiver. For a module, these are the public and
protected methods; for a class, they are the instance (not singleton)
methods. If the optional parameter is `false`, the methods of any
ancestors are not included.

    module A
      def method1()  end
    end
    class B
      include A
      def method2()  end
    end
    class C < B
      def method3()  end
    end

    A.instance_methods(false)                   #=> [:method1]
    B.instance_methods(false)                   #=> [:method2]
    B.instance_methods(true).include?(:method1) #=> true
    C.instance_methods(false)                   #=> [:method3]
    C.instance_methods.include?(:method2)       #=> true

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