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Re: double macro

You can go one step further, and only rebind the argument if it is a CONS
(multiple evaluation of atoms is not a problem. Unless SYMBOL-MACROLET
changed that?). But this can get really cumbersome if you have multiple
arguments. The next obvious (?) step is to write a macro WITH-SAFE-ARGS
that does this for you. I will leave this as an exercise for the reader :-)
     Daniel Ranson.