haskell-mode doesn't work when which-function-mode enabled

[mrkkrp]

After a recent update haskell-mode has lost its ability to function. When I open any Haskell file, I see message "scanning declarations in filename.hs (27%)" or something like this in the minibuffer. Emacs hangs, it's clear that gets in some kind of infinite loop (according to processor usage statistic).

My investigation has shown that it happens only when which-function-mode is enabled. To reproduce: emacs -Q, then (package-initialize) to initialize haskell-mode, then (which-function-mode 1) to enable which-function, then open any *.hs file.

Note that I'm using Emacs 25.0.50.1. As far as I know which-function is built-in functionality that should work OK. So, I guess the problem is in haskell-mode.

[gracjan]

I've reverted in e5afe82. Still, there must be some twisted logic going on if that commit broke scanning.

[mrkkrp]

@gracjan, thank you. Now that problem has gone.

[mrkkrp]

@gracjan, please note that last commit fixed indentation too (it was really strange, but that was a minor problem).