gist: 36839


  
    
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              def Object.method_defined_where(method)
  self.ancestors.detect { |a| a.methods(false).include?(method.to_s) }
end
 
#Usage - define in your .irbrc and then:
#File.method_defined_where('read')
#=> IO
 
#For something more in depth, use http://github.com/spicycode/the-inspector/tree/master/spec/unit/inspector_spec.rb
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