Can I find the file/linenumber where a method was defined?

Duplicate: How To Find Where A Ruby Method Is Defined At Runtime

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With a given object, is it possible to find out where each method was defined?

From stackoverflow

• After the fact, it will be pretty tough, but you can use a hook method to observe the line numbers where a method is defined.

  class X < Object
  
    def X.method_added(symbol)
      puts "adding method #{symbol} to class X from #{caller(0)"
    end
  
  end
  
  
  class X
    def a_method
    end
  end