inspect

        # Socket::UDPSource.inspect

(from ruby core)
### Implementation from Object
---
    obj.inspect   -> string

---

Returns a string containing a human-readable representation of *obj*.
The default #inspect shows the object's class name, an encoding of its
memory address, and a list of the instance variables and their values
(by calling #inspect on each of them).  User defined classes should
override this method to provide a better representation of *obj*.  When
overriding this method, it should return a string whose encoding is
compatible with the default external encoding.

    [ 1, 2, 3..4, 'five' ].inspect   #=> "[1, 2, 3..4, \"five\"]"
    Time.new.inspect                 #=> "2008-03-08 19:43:39 +0900"

    class Foo
    end
    Foo.new.inspect                  #=> "#<Foo:0x0300c868>"

    class Bar
      def initialize
        @bar = 1
      end
    end
    Bar.new.inspect                  #=> "#<Bar:0x0300c868 @bar=1>"