gistfile1.txt

$ ./dfsch-repl 
  /\___/\    dfsch version 0.4.0-dev
 ( o   o )     (rel-0.3.0-1219-g0ae9b2e) [Nov 15 2011 05:35:34]
 ==  *  ==   dfsch is free software, and you are welcome to redistribute it
   )   (     under certain conditions; see file COPYING for details.

]=> (car :mnau)
debugger invoked on type-error:
  :mnau is not an instance of #<abstract-type 0x7ff0b410bae0 pair instance-size: 16>
    :instance-suffices?: true
    :type: #<abstract-type 0x7ff0b410bae0 pair instance-size: 16>
    :datum: :mnau

trace buffer:
  EVAL (car :mnau) ()
     @ *console-io*:1
  APPLY #<primitive 0x7ff0b410e020 car> ()
  APPLY #<primitive 0x7ff0b3e6d620 enter_debugger> ()

restarts:
   0: [use-value] Retry with alternate value
   1: [abort] Return to reader
   2: [terminate-thread] Terminate current thread
dbg1> 0
Alternate value: (nyan)
nyan