((0 "((LAMBDA (SWANK-BACKEND::DEBUGGER-LOOP-FN)) #<FUNCTION (LAMBDA #) {100459BBC9}>)")
 (1 "(SB-INT:SIMPLE-EVAL-IN-LEXENV (SWANK-BACKEND:CALL-WITH-DEBUGGING-ENVIRONMENT (LAMBDA () (SWANK:BACKTRACE 0 NIL))) #<NULL-LEXENV>)")
 (2 "(SWANK::EVAL-REGION \"(swank-backend:call-with-debugging-environment\\n            (lambda ()\\n              (swank:backtrace 0 nil)))\\n\\n\")")
 (3 "((LAMBDA ()))") ...)