Emacs hangs in haskell-mode with inferior-haskell-load-file call

Question

When in a Haskell file, I use C-c C-l to run the command inferior-haskell-load-file which is intended to load the current file into the GHCI interprete

Answer 1

inferior-haskell-mode does some parsing based upon the expected ghci prompt. As such, if you change the prompt in a .ghci file, then it can't detect it.

For more information, see where haskell-ghci.el sets the comint-prompt-regexp value to determine what a prompt is.

;; GHCi prompt should be of the form `ModuleName> '.
(setq comint-prompt-regexp
      "^\\*?[[:upper:]][\\._[:alnum:]]*\\( \\*?[[:upper:]][\\._[:alnum:]]*\\)*> ")

If you want to keep the setting in your .ghci file, then it may be possible to customise this settings.