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method_missing 

        # Gem::Specification.method_missing

(from ruby core)
### Implementation from BasicObject
---
    obj.method_missing(symbol [, *args] )   -> result

---

Invoked by Ruby when *obj* is sent a message it cannot handle. *symbol*
is the symbol for the method called, and *args* are any arguments that
were passed to it. By default, the interpreter raises an error when this
method is called. However, it is possible to override the method to
provide more dynamic behavior. If it is decided that a particular method
should not be handled, then *super* should be called, so that ancestors
can pick up the missing method. The example below creates a class
`Roman`, which responds to methods with names consisting of roman
numerals, returning the corresponding integer values.

    class Roman
      def roman_to_int(str)
        # ...
      end

      def method_missing(symbol, *args)
        str = symbol.id2name
        begin
          roman_to_int(str)
        rescue
          super(symbol, *args)
        end
      end
    end

    r = Roman.new
    r.iv      #=> 4
    r.xxiii   #=> 23
    r.mm      #=> 2000
    r.foo     #=> NoMethodError

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