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Re: How's that again?

> Thanks.  Is "IGNORABLE" as portable as "IGNORE"?  What about IGNORE-IF-UNUSED?
> (see below).  My code has to compile in three different common lisps.
> (MCL, Franz, Harlequin).  

IGNORABLE is in the proposed ANSI standard for Common Lisp.  I don't know 
whether the implementations (other than MCL) that you mentioned have gotten 
around to supporting it yet though.