This is an implementation of Daniel Berger’s proposal of structured warnings for Ruby.
They provide dynamic suppression and activation, as well as, an inheritance
hierarchy to model their relations.
This library preserves the old warn signature, but additionally allows a raise-like use.

For more information on the usage and benefits of this library have a look
at the inspiring article at O’Reilly.

http://www.oreillynet.com/ruby/blog/2008/02/structured_warnings_now.html