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/*

* call-seq:

* define_singleton_method(symbol, method) => new_method

* define_singleton_method(symbol) { block } => proc

*

* Defines a singleton method in the receiver. The _method_

* parameter can be a +Proc+ or +Method+ object.

* If a block is specified, it is used as the method body. This block

* is evaluated using <code>instance_eval</code>.

*

* class A

* class << self

* def class_name

* to_s

* end

* end

* end

* A.define_singleton_method(:who_am_i) do

* "I am: #{class_name}"

* end

* A.who_am_i # ==> "I am: A"

*

* guy = "Bob"

* guy.define_singleton_method(:hello) { "#{self}: Hello there!" }

* guy.hello # => "Bob: Hello there!"

*/