sb!kernel::undefined-alien-function-error
sb!kernel::memory-fault-error
sb!di::handle-breakpoint
+ sb!di::handle-single-step-trap
fdefinition-object
#!+sb-thread sb!thread::run-interruption
#!+win32 sb!kernel::handle-win32-exception))
sb!unix::*interrupt-pending*
*gc-inhibit*
*gc-pending*
+ #!-sb-thread
+ *stepping*
;; hash table weaknesses
:key