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SBCL fasl-format is at current stage of development undergoing non-backwards compatible changes fairly often. The following snippet handles recompilation automatically for ASDF-based systems.
(require :asdf)
;;; If a fasl was stale, try to recompile and load (once).
(defmethod asdf:perform :around ((o asdf:load-op)
(c asdf:cl-source-file))
(handler-case (call-next-method o c)
;; If a fasl was stale, try to recompile and load (once).
(sb-ext:invalid-fasl ()
(asdf:perform (make-instance 'asdf:compile-op) c)
(call-next-method))))