plutonas@debian:~$ sbcl
This is SBCL 0.8.16, an implementation of ANSI Common Lisp.
More information about SBCL is available at <http://www.sbcl.org/>.

SBCL is free software, provided as is, with absolutely no warranty.
It is mostly in the public domain; some portions are provided under
BSD-style licenses.  See the CREDITS and COPYING files in the
distribution for more information.
* (require 'asdf)

NIL
* (require 'stumpwm)
; in: LAMBDA NIL
;     (SB-KERNEL:FLOAT-WAIT)
;
; note: deleting unreachable code
; compilation unit finished
;   printed 1 note
; in: LAMBDA NIL
;     (SB-KERNEL:FLOAT-WAIT)
;
; note: deleting unreachable code
; compilation unit finished
;   printed 1 note

; loading system definition from #P"/usr/lib/sbcl/systems/sb-bsd-sockets.asd"
; into #<PACKAGE "ASDF3894">
; registering #<SYSTEM SB-BSD-SOCKETS {9500039}> as SB-BSD-SOCKETS
; registering #<SYSTEM SB-BSD-SOCKETS-TESTS {97EAC91}> as SB-BSD-SOCKETS-TESTS

debugger invoked on a UNDEFINED-FUNCTION in thread 14388:
  The function SPLIT-STRING is undefined.

You can type HELP for debugger help, or (SB-EXT:QUIT) to exit from SBCL.

restarts (invokable by number or by possibly-abbreviated name):
  0: [RETRY   ] Retry performing #<ASDF:LOAD-OP NIL {9832DC1}> on
                #<ASDF:CL-SOURCE-FILE "input" {9821869}>.
  1: [ACCEPT  ] Continue, treating #<ASDF:LOAD-OP NIL {9832DC1}> on
                #<ASDF:CL-SOURCE-FILE "input" {9821869}> as having been
                successful.
  2: [ABORT   ] Reduce debugger level (leaving debugger, returning to toplevel).
  3: [TOPLEVEL] Restart at toplevel READ/EVAL/PRINT loop.
(SB-KERNEL::UNDEFINED-FUN-ERROR-HANDLER
 4
 #<unavailable argument>
 #.(SB-SYS:INT-SAP #XB7BE03E0)
 #<SB-ALIEN-INTERNALS:ALIEN-VALUE :SAP #XB7BE00DC :TYPE (*
                                                         (SB-ALIEN:STRUCT
                                                          SB-VM::OS-CONTEXT-T-STRUCT))>
 (14))[:EXTERNAL]
0]