Detector for unused variables

[bearophile]

Namespace:
> I wrote a short programm which detect and list unused variables.

I suggest to attach both code and testcases to:
http://d.puremagic.com/issues/show_bug.cgi?id=3960

Even if your code will never be used, it shows Walter&Andrei that 
there is interest in having this warning, and test cases are 
useful for other implementations too.

Bye,
bearophile