While I'm whining... If, in the *slime-repl*, you do XOS> (setf *print-base* 16) the next time to you C-c C-c to compile a completely innocuous and correct function, you end up with this: ;;; Compiling file /tmp/filebPzYl6.lisp ... ;;; Safety = 3, Speed = 1, Space = 1, Float = 1, Interruptible = 0 ;;; Compilation speed = 1, Debug = 2, Fixnum safety = 3 ;;; Source level debugging is on ;;; Source file recording is on ;;; Cross referencing is on **++++ Error between functions: The variable |1501E| is unbound. ; *** 1 error detected, no fasl file produced. Cheers, --ap