HIE type on hover dies because of specific file

[freeman42x]

How to reproduce:

• do a checkout of https://github.com/razvan-panda/Haskell-Book at SHA f80e738fd58be820258aed8b44e8c7cdf5c60054

• open one of the files Ch15, Ch16 or Ch16Rearrange - type on hover will function

• open Ch17 and hover over anything - type on hover is not working on this file or the previous files on which it worked

This bug can be reproduced both in Atom and in VSCode

[freeman42x]

It dies with the following console error in Atom:

01:58:11.524 logger.ts:19 Haskell (hie) stderr hie: gfromJust initRdrNameMap Nothing
warn @ logger.ts:19
stderr.split.filter.forEach @ auto-languageclient.ts:698
handleServerStderr @ auto-languageclient.ts:698
childProcess.stderr.on @ auto-languageclient.ts:341
emitOne @ events.js:96
emit @ events.js:191
readableAddChunk @ _stream_readable.js:178
Readable.push @ _stream_readable.js:136
onread @ net.js:560
01:58:11.524 logger.ts:19 Haskell (hie) stderr CallStack (from HasCallStack):
warn @ logger.ts:19
stderr.split.filter.forEach @ auto-languageclient.ts:698
handleServerStderr @ auto-languageclient.ts:698
childProcess.stderr.on @ auto-languageclient.ts:341
emitOne @ events.js:96
emit @ events.js:191
readableAddChunk @ _stream_readable.js:178
Readable.push @ _stream_readable.js:136
onread @ net.js:560
01:58:11.524 logger.ts:19 Haskell (hie) stderr   error, called at src/Language/Haskell/GHC/ExactPrint/Utils.hs:622:27 in ghc-exactprint-0.5.6.0-E46BVefKuiy3GRzydLcKBg:Language.Haskell.GHC.ExactPrint.Utils
warn @ logger.ts:19
stderr.split.filter.forEach @ auto-languageclient.ts:698
handleServerStderr @ auto-languageclient.ts:698
childProcess.stderr.on @ auto-languageclient.ts:341
emitOne @ events.js:96
emit @ events.js:191
readableAddChunk @ _stream_readable.js:178
Readable.push @ _stream_readable.js:136
onread @ net.js:560

This was happening when the Ch17.hs file content was:

{-# LANGUAGE InstanceSigs #-}

module Ch17 where

import           Control.Applicative
import           Data.List
import           Data.Monoid

[freeman42x]

Getting a different error now (playing around with divide and conquer on the file). It appears it dies on bad classify pragma:

02:11:01.160 logger.ts:19 Haskell (hie) stderr /run/user/1000/ghc-mod22759/Ch1722758-2.hs:9:9: Error while reading hi
warn @ logger.ts:19
stderr.split.filter.forEach @ auto-languageclient.ts:698
handleServerStderr @ auto-languageclient.ts:698
childProcess.stderr.on @ auto-languageclient.ts:341
emitOne @ events.js:96
emit @ events.js:191
readableAddChunk @ _stream_readable.js:178
Readable.push @ _stream_readable.js:136
onread @ net.js:560
02:11:01.236 logger.ts:19 Haskell (hie) stderr nt file, bad classify pragma
warn @ logger.ts:19
stderr.split.filter.forEach @ auto-languageclient.ts:698
handleServerStderr @ auto-languageclient.ts:698
childProcess.stderr.on @ auto-languageclient.ts:341
emitOne @ events.js:96
emit @ events.js:191
readableAddChunk @ _stream_readable.js:178
Readable.push @ _stream_readable.js:136
onread @ net.js:560
02:11:01.236 logger.ts:19 Haskell (hie) stderr module "HLint: Move brackets to avoid $"
warn @ logger.ts:19
stderr.split.filter.forEach @ auto-languageclient.ts:698
handleServerStderr @ auto-languageclient.ts:698
childProcess.stderr.on @ auto-languageclient.ts:341
emitOne @ events.js:96
emit @ events.js:191
readableAddChunk @ _stream_readable.js:178
Readable.push @ _stream_readable.js:136
onread @ net.js:560
02:11:01.236 logger.ts:19 Haskell (hie) stderr hie: ExitFailure 1
warn @ logger.ts:19
stderr.split.filter.forEach @ auto-languageclient.ts:698
handleServerStderr @ auto-languageclient.ts:698
childProcess.stderr.on @ auto-languageclient.ts:341
emitOne @ events.js:96
emit @ events.js:191
readableAddChunk @ _stream_readable.js:178
Readable.push @ _stream_readable.js:136
onread @ net.js:560

[freeman42x]

Removing the invalid classify pragma fixed the issue. Not sure what further actions should be taken regarding this ticket, but it was very confusing as to why it was not working.

Just having:

{-# LANGUAGE InstanceSigs #-}

module Ch17 where

in the file was also killing HIE.

[alanz]

We now have better exception handling in hie.

Does the original problem still occur with current master?

[freeman42x]

I'm testing on NixOS and run into following issue when updating HIE to latest version: domenkozar/hie-nix#13

[alanz]

I know @domenkozar said something about the update getting more complicated because hie now uses submodules.

I am not sure if that repo deals with them properly yet.

[freeman42x]

@alanz Still having the same issues with HIE a4e21f4

[krikchaip]

The problem still occurs.
In my case, It happens occasionally when i tried to copy a code and then paste into the editor(VSCode). Not sure whether problem came from HIE itself or a language server extension.

here’s some part of logs i think it’s informative

... blah blah
hie: gfromJust initRdrNameMap Nothing
CallStack (from HasCallStack):
  error, called at src/Language/Haskell/GHC/ExactPrint/Utils.hs:622:27 in ghc-exactprint-0.5.6.1-JGvkCVQspir2AFrA6YrhNv:Language.Haskell.GHC.ExactPrint.Utils

[alanz]

Can you provide the rest of the callstack?

[krikchaip]

@alanz okay. This isn’t the same file as above but still reproduces the same problem.

[alanz]

Can you make the project available (or a subset of it) so we can test locally?

[krikchaip]

Here you go (SHA:d99e9f9885f2cf2574e050cc3c535535b4e0e94e)
Anyway, thanks in advance.

[domenkozar]

Love it: learned haskell, caught my annoying bug :)

[alanz]

@domenkozar explain?

[alanz]

@krikchaip Are you running this on nix? I am unable to reproduce the problem,