bug#6596: 23.2; cl.texi docs loop destructuring for alist

[Kevin Ryde <user42@zip.com.au>]

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I didn't immediately realize the cl `loop' macro destructuring could be
used to crunch an alist.  Perhaps an example in the manual per below.
If you're not a cl programmer you need lots of examples to understand
that huge `loop' thing :-).

2010-07-10  Kevin Ryde  <user42@zip.com.au>

	* cl.texi (For Clauses): Add destructuring example processing an
	alist.


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--- cl.texi.orig	2010-07-10 09:37:14.000000000 +1000
+++ cl.texi	2010-07-10 09:38:54.000000000 +1000
@@ -2599,7 +2599,14 @@
 than values the trailing variables get the value @code{nil}.
 If @code{nil} is used as a variable name, the corresponding
 values are ignored.  Destructuring may be nested, and dotted
-lists of variables like @code{(x . y)} are allowed.
+lists of variables like @code{(x . y)} are allowed, so for example
+to process an alist
+
+@example
+(loop for (key . value) in '((a . 1) (b . 2))
+      collect value)
+     @result{} (1 2)
+@end example
 
 @node Iteration Clauses, Accumulation Clauses, For Clauses, Loop Facility
 @subsection Iteration Clauses

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