Back of the envelope method mirror in Ruby

mirror.rb

class Mirror < BasicObject
  def initialize(target)
    @target = target
  end
  
  def method_missing(sym, *args)
    @target.method(sym) rescue nil
  end
  
  def respond_to_missing?(sym, priv=false)
    !!send(sym)
  end
end

if __FILE__ == $0
  m = Mirror.new(Object.new)
  m.to_s # Object's to_s method
  m.to_s.call # "#<Object:0x....>"
end