Prevent stylish-haskell errors

[ivan-m]

With haskell-stylish-on-save set to t and something that stylish-haskell can't parse (via haskell-src-exts) in a buffer, e.g.

{-# LANGUAGE ConstraintKinds #-}
{-# LANGUAGE MultiParamTypeClasses #-}

class Foo c a where

  bar :: (c a) => a -> a

every time the buffer is saved the *Warnings* buffer pops up (typically overriding another buffer I had open, thus forcing me to change it back) with a parse error from stylish-haskell.

Is there a way to prevent this? It seems that this is because of the explicit call to display-warnings in

haskell-mode/haskell-commands.el

Line 760 in a165795

(display-warning cmd (apply 'format fmt args) :warning))))

[purcell]

Yeah, I want this myself. I think it's reasonable to just ignore error output from stylish because if the buffer is unparsable, the user is going to be getting clearer feedback about it from another tool, e.g. flycheck, or trying to load it in ghci.

[rietmann]

I figured out a fix for this: M-x customize-group, warnings

Then switch the Warning Minimum Level: from :warning to :error.

Or in init.el
(custom-set-variables
`(warning-minimum-level :error))

[gracjan]

@ivan-m, @purcell, @rietmann: can you check if referenced commit fixes your issue?