$ sbcl --noinform
* (asdf:load-system 'cl-json)

T
* (sb-ext:save-lisp-and-die "sbcl-core")

debugger invoked on a SB-INT:INVALID-ARRAY-INDEX-ERROR in thread
#<THREAD "main thread" RUNNING {1001BB6403}>:
  Invalid index 262 for (SIMPLE-VECTOR
                         7), should be a non-negative integer below 7.

Type HELP for debugger help, or (SB-EXT:EXIT) to exit from SBCL.

restarts (invokable by number or by possibly-abbreviated name):
  0: [ABORT] Exit debugger, returning to top level.

((SB-IMPL::OPTIMIZED-DATA-VECTOR-REF T) #<unavailable argument> #<unavailable argument>)
0]