collect: Declare results as having type list.

It seems that CMU CL can't work this out on its own.  I suppose that's
not completely surprising.

diff --git a/collect.lisp b/collect.lisp
index 946ba91..219f351 100644 (file)
--- a/collect.lisp
+++ b/collect.lisp
@@ -45,7 +45,7 @@
        ((atom vars) (setf vars (list vars))))
   `(let ,(mapcar (lambda (v) `(,v (make-collector))) vars)
      ,@body
-     (values ,@(mapcar (lambda (v) `(cdr ,v)) vars))))
+     (values ,@(mapcar (lambda (v) `(the list (cdr ,v))) vars))))
 
 (defmacro with-collection (vars collection &body body)
   "Collect items into lists VARS according to the form COLLECTION; then