[Haskell-cafe] shorter error messages

Richard Eisenberg rae at richarde.dev
Tue Mar 16 18:07:41 UTC 2021

There is no "official" way to accommodate this reasonable request. The ideas up-thread are good ones.

I want to pipe in that we're currently going through an internal overhaul of error-message handling that will make such a request much easier to contemplate in the future. This is active work going on right now. So there is hope, possibly for 9.4. Of course, once the internal overhaul is done, we'll need to design any features that actually change the output -- the overhaul just makes it easy to implement such features (which would be very difficult at the moment).


> On Mar 16, 2021, at 12:56 PM, Jaro Reinders <jaro.reinders at gmail.com> wrote:
> On 16-03-2021 17:40, Tom Smeding wrote:
>> In any case, the haskell language server just uses GHC internally, so it just shortens the GHC message. But then I believe the same result could be accomplished by some simple text manipulation on GHC's normal output.
> In fact, you can use -ddump-json to get JSON error messages. I should be easy to convert that to any form you like.
> But there is no clear specification of that output:
> https://gitlab.haskell.org/ghc/ghc/-/issues/19278
> And I also want to point out that there is a big open issue for better error messages:
> https://gitlab.haskell.org/ghc/ghc/-/issues/8809
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