haskell-process-suggest-pragma hangs emacs

[drewr]

Using haskell-mode-20150707.57 with interactive-haskell-mode, whenever haskell-process-suggest-pragma is triggered, it sometimes works, and sometimes hangs emacs. After that a C-g will suspend the process and try to dump core.

[johnwalker]

Is this specific to stack-ghci?

[drewr]

I think so. I can't quite tell because I've been switching back and forth quite a bit. I'll switch back to cabal for a bit and see if it's triggered.

[drewr]

I switched back to cabal-repl and the first time I responded n it hung.

[vlatkoB]

It is happening to me with cabal-repl as well. I found out that it is because of haskell-doc being active during suggestions. And I have to C-g 3 times to get out of it. :-)

I made a workaround until this gets fixed:

(defun haskell-process-trigger-suggestions-ad (orig-fun &rest args)
  (turn-off-haskell-doc)
  (apply orig-fun args)
  (turn-on-haskell-doc))

(advice-add 'haskell-process-trigger-suggestions
   :around #'haskell-process-trigger-suggestions-ad)

[gracjan]

Closing in favor of #820, there is more information there.