Comment.

[gnu-emacs] / lisp / emacs-lisp / cl.el

diff --git a/lisp/emacs-lisp/cl.el b/lisp/emacs-lisp/cl.el
index def4d24188c3e6f4075ee71e2b2ed87437989c4d..f2ced20e59e36ef795177ad28380df7f9f4c921e 100644 (file)
--- a/lisp/emacs-lisp/cl.el
+++ b/lisp/emacs-lisp/cl.el
@@ -178,7 +178,7 @@ Keywords supported:  :test :test-not :key"
 (defun cl-set-substring (str start end val)
   (if end (if (< end 0) (incf end (length str)))
     (setq end (length str)))
-  (if (< start 0) (incf start str))
+  (if (< start 0) (incf start (length str)))
   (concat (and (> start 0) (substring str 0 start))
          val
          (and (< end (length str)) (substring str end))))
@@ -207,7 +207,7 @@ Keywords supported:  :test :test-not :key"
   "Return multiple values, Common Lisp style.
 The arguments of `values' are the values
 that the containing function should return."
-  (apply 'list values))
+  values)
 
 (defsubst values-list (list)
   "Return multiple values, Common Lisp style, taken from a list.
@@ -229,6 +229,10 @@ right when EXPRESSION calls an ordinary Emacs Lisp function that returns just
 one value."
   (apply function expression))
 
+(defalias 'multiple-value-call 'apply
+  "Apply FUNCTION to ARGUMENTS, taking multiple values into account.
+This implementation only handles the case where there is only one argument.")
+
 (defsubst nth-value (n expression)
   "Evaluate EXPRESSION to get multiple values and return the Nth one.
 This handles multiple values in Common Lisp style, but it does not work
@@ -514,6 +518,15 @@ Thus, `(list* A B C D)' is equivalent to `(nconc (list A B C) D)', or to
       (push (pop list) res))
     (nreverse res)))
 
+(defun copy-list (list)
+  "Return a copy of a list, which may be a dotted list.
+The elements of the list are not copied, just the list structure itself."
+  (if (consp list)
+      (let ((res nil))
+       (while (consp list) (push (pop list) res))
+       (prog1 (nreverse res) (setcdr res list)))
+    (car list)))
+
 (defun cl-maclisp-member (item list)
   (while (and list (not (equal item (car list)))) (setq list (cdr list)))
   list)
@@ -665,8 +678,8 @@ Keywords supported:  :test :test-not :key"
 (defun cl-hack-byte-compiler ()
   (if (and (not cl-hacked-flag) (fboundp 'byte-compile-file-form))
       (progn
-       (cl-compile-time-init)   ; in cl-macs.el
-       (setq cl-hacked-flag t))))
+       (setq cl-hacked-flag t)         ; Do it first, to prevent recursion.
+       (cl-compile-time-init))))       ; In cl-macs.el.
 
 ;;; Try it now in case the compiler has already been loaded.
 (cl-hack-byte-compiler)