Just to make the recovery a little quicker, if it's intended:

diff -rN -u old-alexandria/package.lisp new-alexandria/package.lisp --- old-alexandria/package.lisp 2007-09-23 22:53:58.000000000 +0400 +++ new-alexandria/package.lisp 2007-09-23 22:53:59.000000000 +0400 @@ -56,6 +56,7 @@ #:remove-from-plistf #:delete-from-plist #:delete-from-plistf + #:sans #:set-equal #:setp #:unionf

regards, Samium Gromoff