Detect unused variables

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Ah, I see.
I wrote a short code that detects "normal" unused variables. 
"Normal" means those variables, which has built-in types.  This 
means, that no types created by the user/programmer will detect. 
Furthermore, it doesn't detect arrays yet, but maybe there are 
some people here, who would help me to complete it.

unused_vars.d: http://codepad.org/K5OCjlF3
unused_test.d: http://codepad.org/Bk9cXqD2
vertex.d: http://codepad.org/G1HH31Kx

Compile and run with: unused_vars <file>, e.g. unused_vars 
unused_test.d

At this point I would also like to ask if there is something that 
identifies unused imports?