Something has happened to cmucl's CVS repository on common-lisp.net. It appears assembly/mips/assem-rtns.lisp is corrupted.
Thus, DO NOT make any changes until further notice! Fortunately, I have an rsync copy of the entire repository. Unfortunately, it was made shortly after the 2006-09 snapshot, so it will be missing the most recent changes. The issue is being worked on by the c-l.net admins. Ray