Debugger entered--Lisp error: (wrong-type-argument stringp nil)
  string-match("[ \f    \n^M^K]+" nil 0)
  split-string(nil)
  (let ((checker-elts (split-string haskell-saved-check-command))) (list (car checker-elts) (append (cdr checker$
  haskell-flymake-init()
  flymake-start-syntax-check()
  flymake-mode(toggle)
  call-interactively(flymake-mode record nil)
  command-execute(flymake-mode record)
  smex-read-and-run(("flymake-mode" "toggle-debug-on-error" "erc" "recover-session" "save-buffer" "shell" "seman$
  smex()
  call-interactively(smex nil nil)