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-rw-r--r--src/interp/parsing.lisp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/interp/parsing.lisp b/src/interp/parsing.lisp
index ffb2bc55..6a33d361 100644
--- a/src/interp/parsing.lisp
+++ b/src/interp/parsing.lisp
@@ -358,7 +358,7 @@ the stack, then stack a NIL. Return the value of prod."
(loop
(let ((m (length /gensymlist)))
(if (< m n)
- (setq /gensymlist (nconc /gensymlist `(,(intern (format nil "G~D" (1+ m))))))
+ (setq /gensymlist (|append!| /gensymlist `(,(intern (format nil "G~D" (1+ m))))))
(return (nth (1- n) /gensymlist))))))
; 3 D. Managing rule sets