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[Keith Price <email@example.com>: &Rest failure]
Sure the behavior makes sense. I don't know where it says this,
&REST cons its argument on the stack. If you return the result you
get a pointer to somewhere on the stack which by now has probably been
rewritten. You need to do a copy-list if you want to return a list
consed up by &REST. It should generally be safe to pass an &rest
argument as a parameter to other functions, e.g.
(defun test (a &rest b) (foo b))
Of course FOO must then make sure it copies B if it wants to return B.