*scratch*

(progn
  (shell "mysh")
  (insert "cd /tmp")
  (comint-send-input)
  (insert "ls -alG")
  (comint-send-input))


Debugger entered--Lisp error: (error "Marker does not point anywhere")
  ansi-color-apply-on-region(#<marker in no buffer> #<marker at 9 in mysh>)
  ansi-color-process-output("")
  run-hook-with-args(ansi-color-process-output "")
  comint-send-input()
  (progn (shell "mysh") (insert "cd /tmp") (comint-send-input) (insert "ls -alG") (comint-send-input))
  eval((progn (shell "mysh") (insert "cd /tmp") (comint-send-input) (insert "ls -alG") (comint-send-input)))
  eval-last-sexp-1(nil)
  eval-last-sexp(nil)
  call-interactively(eval-last-sexp nil nil)