haskell/haskell-mode — pull request #243 by markus1189 (2014-02-25 15:19:40+00:00)
Title: Customize option: haskell-completing-read-function

(This is intended to be merged after the build was fixed)
I found it is better to use a custom `haskell-completing-read-function` variable. This is because while `(defvar completing-read-function)` does not give errors in emacs23, any function calling `completing-read-function` will fail because the value is `nil`.

Instead of the defvar approach, I changed everything to use `haskell-completing-read-funcion` and added a customize entry with default `ido-completing-read` and some possible choices.

Best,
Markus