No used variable warnings?

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What determines whether unused variables will generate a warning upon 
closing a program?  I am modifying this program that has many unused 
variables that I want to clean up but I wanted the interpreter to list 
them all for me so that I don't clean up the ones I really need.  But I 
get no warnings at all when my progam exits.  I even declared some bogus 
variables that I know aren't used but still no warnings.

I also wrote a simple test program with some unused variables and they 
do get reported...

I am using version 2.2 and I am not using "without warning".

Is there a way to force unused variable reporting?

-- Brian

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