[pro] Defined but no used variable warning during setf expansion

[Sam Steingold]

> * Burton Samograd <ohegba.fnzbtenq at tznvy.pbz> [2012-01-23 06:18:16 -0700]:
>
> ; caught STYLE-WARNING:
> ;   The variable #:G1175 is defined but never used.

I think this is a compiler bug: "defined but never used" warnings should
only be signaled for interned symbols, not gensyms.
Macros often define gensyms which might not be used by some macro uses.

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Sam Steingold (http://sds.podval.org/) on Ubuntu 11.10 (oneiric) X 11.0.11004000
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