+ (let ((run-time (- (get-internal-run-time) start-time)))
+ ;; KLUDGE: Sometimes we see the second getrusage() call
+ ;; return a smaller value than the first, which can
+ ;; lead to *GC-RUN-TIME* to going negative, which in
+ ;; turn is a type-error.
+ (when (plusp run-time)
+ (incf *gc-run-time* run-time))))