Ruby's had something like this for awhile --a test framework called [QED](http://rubyworks.github.com/qed http://rubyworks.github.com/qed). Made for testing, bu

Ruby's had something like this for awhile --a test framework called [QED](http://rubyworks.github.com/qed http://rubyworks.github.com/qed). Made for testing, but technically it could be used for anything.