;;;; This software is part of the SBCL system. See the README file for ;;;; more information. ;;;; ;;;; This software is derived from the CMU CL system, which was ;;;; written at Carnegie Mellon University and released into the ;;;; public domain. The software is in the public domain and is ;;;; provided with absolutely no warranty. See the COPYING and CREDITS ;;;; files for more information. (in-package "SB-COLD") ;;; RENAME-PACKAGE in two steps in order to avoid the possibility of undefined ;;; behavior when one of the new names is the same as one of the old names. ;;; (ANSI on RENAME-PACKAGE: "The consequences are undefined if new-name or any ;;; new-nickname conflicts with any existing package names.") (defun rename-package-carefully (package-designator new-name &optional new-nicknames) (let ((package (find-package package-designator)) (unused-name "UNUSED-PACKAGE-NAME")) (assert (not (find-package unused-name))) (assert (not (string= unused-name new-name))) (assert (not (find unused-name new-nicknames :test #'string=))) (assert (not (find new-name new-nicknames :test #'string=))) (rename-package package unused-name) (rename-package package new-name new-nicknames))) (compile 'rename-package-carefully)