Optimized list generation with nconc vs. append

[umlisp.git] / parse-common.lisp

diff --git a/parse-common.lisp b/parse-common.lisp
index 67a523636f787679afcac0c3689f4747700467b7..ae7af531d762865617de025b4ad5bc2d9b998acc 100644 (file)
--- a/parse-common.lisp
+++ b/parse-common.lisp
@@ -45,8 +45,8 @@
 (defun ufile-pathname (ufile &optional (extension ""))
   "Return pathname for a umls filename with an optional extension"
   (assert (typep ufile 'ufile))
-  (let* ((dirs (append (list (dir ufile))
-                       (awhen (subdir ufile) (list it))))
+  (let* ((dirs (nconc (list (dir ufile))
+                      (awhen (subdir ufile) (list it))))
          (name-list (delimited-string-to-list (fil ufile) #\.))
          (name (if (second name-list)
                    (first name-list)