Punish code that is not tested

[jmesserly]

after running tests, delete code that was not called.
it's a feature: guaranteed 100% code coverage!

[GUIpsp]

You don't need testing if you write it properly the first time

[LeFreq]

Code re-use guidelines allow unused code to stay in place, for the case that it gets used at a later time in the code's future. But it does bring to mind, how one could lexically partition code which is not used yet, but suggested for the future.