Allow any expression as the stop value for a loop

user-side-compiler/parser.lisp

@@ -281,7 +281,7 @@ comma ',' is required to separate arguments.")))
   (make-instance 'node-dotimes
                  :source *syntax-source*
                  :counter-ref (transform var 'reference-variable)
-                 :stop-ref (transform n 'reference)
+                 :stop-ref n
                  :loopee-node (transform code 'node)))
 
 (define-syntax-matcher if (test then else)