Language Pragma causes hanging in haskell-lexeme-looking-at-token about haskell-mode

[purcell]

Thanks for digging into this and providing the helpful specific information! Currently I think I'm the only "maintainer" (semi-)actively responding to issues but I am generally quite inactive atm and I will likely struggle to find time to tackle this.

[michzappa]

I just played around with a minimal version of my config and quickly found the offending customization: (add-hook 'prog-mode-hook #'(lambda () (modify-syntax-entry ?- "w"))). It probably breaks the assumptions made by this haskell-mode looking-at function for the syntax table and causes the looping.

Doesn't look like a problem with haskell-mode, and also doesn't seem to merit any documentation changes since I doubt this is a common configuration. I'll probably just add a workaround in my own config to remove this syntax change in haskell-mode.

Thanks!

[purcell]

Ah cool, thanks for following up with this info. It rings a bell w.r.t. past reported issues, I believe...

[flocks]

Hello @michzappa I'm running into what looks like the same issue, and I'm not sure if you finally found a way to work around it?

[flocks]

Ok, got it I guess you had

 (add-hook 'after-change-major-mode-hook (lambda () (modify-syntax-entry ?- "w")))

somewhere in your config (like I have). I confirm removing this line fix the behavior