Invalid import is not reported and it breaks the eval plugin

[noughtmare]

My environment

OS: MacOS
GHC 9.10.1 from ghcup
Project: https://github.com/noughtmare/tmp.oYnk68xwKl
LSP client: VS Codium+vscode-haskell
HLS: 2.9.0.1 from ghcup
No special configuration

Steps to reproduce

1. open app/Main.hs
2. wait until HLS finishes loading
3. (optional) click the Evaluate... action

Expected behaviour

First of all, of course there is an obvious error in the project: the Foo module is not listed in the cabal file. This issue is about how HLS functions in spite of that error.

I expect an error on the line import Foo in app/Main.hs, because that module is not valid in the cabal package. Furthermore, clicking the Evaluate... action should either work without problems or it would also be acceptable if the action was not shown in the first place.

Actual behaviour

HLS reports no errors in app/Main.hs. Clicking the Evaluate... action results in a cryptic error:

eval: Internal Error: BadDependency "GhcSessionDeps"

Debug information

2025-02-05T09:27:43.927413Z | Error | eval: Internal Error: BadDependency "GhcSessionDeps"
[Error - 10:27:43] Request workspace/executeCommand failed.
  Message: eval: Internal Error: BadDependency "GhcSessionDeps"
  Code: -32603 

[lambdajon]

I have same issue with GHC 9.4.8 and GHC 9.6.7 versions and HLS: 2.10.0.0 from ghcup

[dschrempf]

For reference, this is the debug log I get when running GHC 910, HLS on master:

2025-04-23T18:08:06.640684Z | Debug | Finished: eval.getUriContents Took: 0.00s
2025-04-23T18:08:06.641450Z | Debug | Finished build session
AsyncCancelled
HasCallStack backtrace:
  collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:92:13 in ghc-internal:GHC.Internal.Exception
  toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/IO.hs:260:11 in ghc-internal:GHC.Internal.IO
  throwIO, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:195:43 in ghc-internal:GHC.Internal.Control.Exception.Base


2025-04-23T18:08:06.641726Z | Debug | Restarting build session due to Eval
Action Queue: []
Keys: [IsEvaluating; /home/dominik/scratch/tmp.oYnk68xwKl/app/Main.hs]
Aborting previous build session took 0.00s 
2025-04-23T18:08:06.642462Z | Debug | Finished: runEvalCmd Took: 0.00s
2025-04-23T18:08:06.643136Z | Debug | Finished build session
AsyncCancelled
HasCallStack backtrace:
  collectBacktraces, called at libraries/ghc-internal/src/GHC/Internal/Exception.hs:92:13 in ghc-internal:GHC.Internal.Exception
  toExceptionWithBacktrace, called at libraries/ghc-internal/src/GHC/Internal/IO.hs:260:11 in ghc-internal:GHC.Internal.IO
  throwIO, called at libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs:195:43 in ghc-internal:GHC.Internal.Control.Exception.Base


2025-04-23T18:08:06.643294Z | Debug | Restarting build session due to Eval
Action Queue: []
Keys: [IsEvaluating; /home/dominik/scratch/tmp.oYnk68xwKl/app/Main.hs]
Aborting previous build session took 0.00s 
2025-04-23T18:08:06.643583Z | Error | eval: Internal Error: BadDependency "GhcSessionDeps"

(Not very helpful).