Could not load module ‘Test’ It is a member of the hidden package ‘hie-error-0.1.0.0’.

[Congee]

I can reproduce it with a simple project generated by cabal init. cabal build succeeds, but hie stumbles.

Project structure:

.
├── CHANGELOG.md
├── hie-error.cabal
├── Main.hs
├── Setup.hs
└── src
    └── Test.hs

./Main.hs

module Main where

import Test  -- Could not load module ‘Test’ It is a member of the hidden package ‘hie-error-0.1.0.0’. You can run ‘:set -package hie-error’ to expose it.

main :: IO ()
main = putStrLn "Hello, Haskell!"

./src/Test.hs

module Test where

./hie-error.cabal

cabal-version:       >=1.10
-- Initial package description 'hie-error.cabal' generated by 'cabal init'.
--   For further documentation, see http://haskell.org/cabal/users-guide/

name:                hie-error
version:             0.1.0.0
-- synopsis:
-- description:
-- bug-reports:
-- license:
license-file:        LICENSE
author:              Congee
maintainer:          ...
-- copyright:
-- category:
build-type:          Simple
extra-source-files:  CHANGELOG.md

library
  exposed-modules:     Test
  hs-source-dirs:      src
  default-language:    Haskell2010
  build-depends:       base

executable hie-error
  main-is:             Main.hs
  -- other-modules:
  -- other-extensions:
  build-depends:       base >=4.13 && <4.14, hie-error
  -- hs-source-dirs:
  default-language:    Haskell2010

Nothing interesting in the hie output

2020-08-22 18:18:15.2609133 [ThreadId 77] - Consulting the cradle for "/tmp/hie-error/Main.hs"
Output from setting up the cradle Cradle {cradleRootDir = "/tmp/hie-error", cradleOptsProg = CradleAction: Cabal}
> Resolving dependencies...
> Build profile: -w ghc-8.8.4 -O1
> In order, the following will be built (use -v for more details):
>  - hie-error-0.1.0.0 (lib) (configuration changed)
>  - hie-error-0.1.0.0 (exe:hie-error) (configuration changed)
> Configuring library for hie-error-0.1.0.0..
> Warning: The 'license-file' field refers to the file 'LICENSE' which does not
> exist.
> Preprocessing library for hie-error-0.1.0.0..
> Building library for hie-error-0.1.0.0..
> [1 of 1] Compiling Test             ( src/Test.hs, /tmp/hie-error/dist-newstyle/build/x86_64-linux/ghc-8.8.4/hie-error-0.1.0.0/build/Test.o )
> Configuring executable 'hie-error' for hie-error-0.1.0.0..
> Warning: The package has an extraneous version range for a dependency on an
> internal library: hie-error -any && ==0.1.0.0. This version range includes the
> current package but isn't needed as the current package's library will always
> be used.
> Warning: The 'license-file' field refers to the file 'LICENSE' which does not
> exist.

However, Putting ./src/Test.hs in the project root makes hie happy.

cabal: 3.2.0.0
ghc: 8.8.4
hie: b6c1551 Fri Aug 21 16:04:47 2020 +0100

I believe this issue differs from #299

[fendor]

I can not reproduce on NixOS. Can you invoke haskell-language-server --debug Main.hs and paste the logs here?

What is your cabal version?

[Congee]

Thank you for taking a look. I'm using
ghc 8.8.4, base-4.13.0.0, cabal 3.2.0.0,
haskell-language-server is up-to-date using ec82770

And, I haven't added hie.yml yet

logs for 8.8.4

/tmp/hie-error$ haskell-language-server-8.8.4 --debug app/Main.hs
haskell-language-server version: 0.4.0.0 (GHC: 8.8.4) (PATH: /home/congee/.cabal/bin/haskell-language-server-8.8.4)
(haskell-language-server)Ghcide setup tester in /tmp/hie-error.
Report bugs at https://github.com/haskell/haskell-language-server/issues

Tool versions found on the $PATH
cabal:          3.2.0.0
stack:          2.3.3
ghc:            8.8.4


Step 1/4: Finding files to test in /tmp/hie-error
Found 1 files

Step 2/4: Looking for hie.yaml files that control setup
Found 1 cradle

Step 3/4: Initializing the IDE

Step 4/4: Type checking the files
[INFO] Consulting the cradle for "/tmp/hie-error/app/Main.hs"
Output from setting up the cradle Cradle {cradleRootDir = "/tmp/hie-error", cradleOptsProg = CradleAction: Cabal}
> cabal: Unknown target '/tmp/hie-error/app/Main.hs'.
> The package hie-error has no file target 'app/Main.hs'.
>
>
File:     /tmp/hie-error/app/Main.hs
Hidden:   no
Range:    1:0-2:0
Source:   cradle
Severity: DsError
Message:
  Failed to parse result of calling cabal

  cabal: Unknown target '/tmp/hie-error/app/Main.hs'.
  The package hie-error has no file target 'app/Main.hs'.




[INFO] finish: User TypeCheck (took 0.04s)Files that failed:

 * /tmp/hie-error/app/Main.hs

Completed (0 files worked, 1 file failed)

logs for 8.10.2

/tmp/hie-error$ haskell-language-server-8.10.2 --debug app/Main.hs
haskell-language-server version: 0.4.0.0 (GHC: 8.10.2) (PATH: /home/congee/.cabal/bin/haskell-language-server-8.10.2)
(haskell-language-server)Ghcide setup tester in /tmp/hie-error.
Report bugs at https://github.com/haskell/haskell-language-server/issues

Tool versions found on the $PATH
cabal:          3.2.0.0
stack:          2.3.3
ghc:            8.10.2


Step 1/4: Finding files to test in /tmp/hie-error
Found 1 files

Step 2/4: Looking for hie.yaml files that control setup
Found 1 cradle

Step 3/4: Initializing the IDE

Step 4/4: Type checking the files
[INFO] Consulting the cradle for "/tmp/hie-error/app/Main.hs"
Output from setting up the cradle Cradle {cradleRootDir = "/tmp/hie-error", cradleOptsProg = CradleAction: Cabal}
> cabal: Unknown target '/tmp/hie-error/app/Main.hs'.
> The package hie-error has no file target 'app/Main.hs'.
>
>
File:     /tmp/hie-error/app/Main.hs
Hidden:   no
Range:    1:0-2:0
Source:   cradle
Severity: DsError
Message:
  Failed to parse result of calling cabal

  cabal: Unknown target '/tmp/hie-error/app/Main.hs'.
  The package hie-error has no file target 'app/Main.hs'.




[INFO] finish: User TypeCheck (took 0.02s)Files that failed:

 * /tmp/hie-error/app/Main.hs

Completed (0 files worked, 1 file failed)

No luck either with hie.yml generated by gen-hie

cradle:
  cabal:
    - path: "src"
      component: "lib:hie-error"

    - path: "app/Main.hs"
      component: "hie-error:exe:hie-error"

[Congee]

BTW, do all cool kids use NixOS nowadays? 🤔

[jneira]

if you like yak shaving you have two main options: nixos or Windows 😝

[fendor]

Haskell and NixOS users have indeed a huge overlap.
Without hie.yaml, I can explain: haskell/cabal#6622

With hie.yaml it should work, afaict, can you paste logs of the execution with hie.yaml?

[Congee]

After renaming hie.yml to hie.yaml, the haskell-language-server worked.

[Congee]

I figured out the problem! That error is not from haskell-language-server but from another plugin https://github.com/dense-analysis/ale