hls crashes after Can't find interface-file declaration for variable errors

[marklemay]

I am getting the "The Haskell (...) server crashed 5 times in the last 3 minutes. The server will not be restarted." possibly because "Request textDocument/codeAction failed".

I disabled almost all optional plugin functionality and generated this log

Unfortunately I cannot make a simple project that exercises this error. I can share a private repo where it seems to always happen if that helps. There may be different errors that make this hard to reproduce.

according to visual studio code:

Version: 1.55.1 (Universal)
Commit: 08a217c4d27a02a5bcde898fd7981bda5b49391b
Date: 2021-04-07T18:22:52.186Z (4 mos ago)
Electron: 11.3.0
Chrome: 87.0.4280.141
Node.js: 12.18.3
V8: 8.7.220.31-electron.0
OS: Darwin x64 19.4.0

follow up to: haskell/vscode-haskell#429

[jneira]

Hi, thanks for the bug report, the log coaains interesting info:

GHC error in desugarer lookup in Ghci1:
  attempting to use module ‘main:Dynamic.Ast’ (/Users/xxx/dtest/src/Dynamic/Ast.hs) which is not loaded
GHC error in desugarer lookup in Ghci1:
  Can't find interface-file declaration for variable $tcExp
    Probable cause: bug in .hi-boot file, or inconsistent .hi file
    Use -ddump-if-trace to get an idea of which file caused the error

hls uses a way to load files similar to ghci, does cabal repl src/Dynamic/Ast.hs works?
(btw i am gonna translate the issue to the haskell-language-server as it seems to be an issue with the server)

[jneira]

The error was produced in hie: haskell/haskell-ide-engine#1100

[jneira]

@marklemay do you use template haskell in the problematic files?

[michaelpj]

I have been meaning to open an issue like this, I often see a similar error.

[marklemay]

@jneira
cabal repl src/Dynamic/Ast.hs seems to work though it doesn't go to the correct module. in the repl :l src/Dynamic/Ast.hs takes me there without errors

Ast.hs may be coming up in the errors because that is the only file I opened from the project in the editor.

I don't believe there is template Haskell in that file specifically, though the project makes use of generics and some temples.

[michaelpj]

Closing as old and quiet