Could not find module

[aveltras]

I'm currently trying to get haskell-language-server to work with a bazel built repo. Failing project here: https://github.com/aveltras/haskell-bazel-nix/tree/4228d1ecf1ad362d04f11ee058d24f25aba61552 The debug outputs are at the bottom of the readme.

I have two bazel targets backend/package-a (executable) and backend/package-b (library) which I'm trying to setup haskell-language-server with. Running hie-bios check on the executable fails which a Could not find module ‘Lib2 even if the directory containing Lib2 is included with -ibackend/package-b/ in the .hie-bios script.

The problem seems to be the same as #275 but I could not find a fix by reading the comments.

[fendor]

Hi!

Is Lib2 listed as a module target? (Not sure about hie-bios but HLS definitely does not just find Modules in the include directories.)

What does the output of hie-bios debug backend/pacakge-a say?

[aveltras]

I'm not sure what you mean by "module target".

hie.yaml

cradle:
  multi:
    - path: ./.
      config: { cradle: { none: } }
    - path: "./backend"
      config:
        cradle:
          bios:
            program: ".hie-bios"

.hie-bios

#!/usr/bin/env bash
set -euo pipefail
bazel build :hie-bios --output_groups=hie_bios --experimental_show_artifacts
cat bazel-bin/hie-bios@hie-bios >"$HIE_BIOS_OUTPUT"
# Make warnings non-fatal
echo -Wwarn >>"$HIE_BIOS_OUTPUT"

cat bazel-bin/hie-bios@hie-bios

-package-id
base-4.14.1.0
-package-id
base-4.14.1.0
-pgma
bazel-out/host/bin/external/rules_haskell/haskell/cc_wrapper-python
-pgmc
bazel-out/host/bin/external/rules_haskell/haskell/cc_wrapper-python
-pgml
bazel-out/host/bin/external/rules_haskell/haskell/cc_wrapper-python
-pgmP
bazel-out/host/bin/external/rules_haskell/haskell/cc_wrapper-python -E -undef -traditional
-optc-fno-stack-protector
-ibackend/package-b/
-ibazel-out/k8-fastbuild/bin/backend/package-b/
-ibackend/package-a/
-ibazel-out/k8-fastbuild/bin/backend/package-a/
backend/package-b/src/Lib2.hs
backend/package-a/src/Main.hs

hie-bios debug backend/package-a

Root directory:        /home/romain/Code/skeleton
Component directory:   /home/romain/Code/skeleton
GHC options:           -package-id base-4.14.1.0 -package-id base-4.14.1.0 -pgma bazel-out/host/bin/external/rules_haskell/haskell/cc_wrapper-python -pgmc bazel-out/host/bin/external/rules_haskell/haskell/cc_wrapper-python -pgml bazel-out/host/bin/external/rules_haskell/haskell/cc_wrapper-python -pgmP "bazel-out/host/bin/external/rules_haskell/haskell/cc_wrapper-python -E -undef -traditional" -optc-fno-stack-protector -ibackend/package-b/ -ibazel-out/k8-fastbuild/bin/backend/package-b/ -ibackend/package-a/ -ibazel-out/k8-fastbuild/bin/backend/package-a/ backend/package-b/src/Lib2.hs backend/package-a/src/Main.hs -Wwarn
GHC library directory: CradleSuccess "/nix/store/dw33h578wv2rqcxl0yhpcrfs33p0rl2r-ghc-8.10.4-with-packages/lib/ghc-8.10.4"
GHC version:           CradleSuccess "8.10.4"
Config Location:       /home/romain/Code/skeleton/hie.yaml
Cradle:                Cradle {cradleRootDir = "/home/romain/Code/skeleton", cradleOptsProg = CradleAction: Multi}
Dependencies:

hie-bios check backend/package-a/src/Main.hs

backend/package-a/src/Main.hs:3:1:Could not find module ‘Lib2’
Perhaps you meant Lib (from libiserv-8.10.4)
Use -v (or `:set -v` in ghci) to see a list of the files searched for.

hie-bios debug backend/package-b

Root directory:        /home/romain/Code/skeleton
Component directory:   /home/romain/Code/skeleton
GHC options:           -package-id base-4.14.1.0 -package-id base-4.14.1.0 -pgma bazel-out/host/bin/external/rules_haskell/haskell/cc_wrapper-python -pgmc bazel-out/host/bin/external/rules_haskell/haskell/cc_wrapper-python -pgml bazel-out/host/bin/external/rules_haskell/haskell/cc_wrapper-python -pgmP "bazel-out/host/bin/external/rules_haskell/haskell/cc_wrapper-python -E -undef -traditional" -optc-fno-stack-protector -ibackend/package-b/ -ibazel-out/k8-fastbuild/bin/backend/package-b/ -ibackend/package-a/ -ibazel-out/k8-fastbuild/bin/backend/package-a/ backend/package-b/src/Lib2.hs backend/package-a/src/Main.hs -Wwarn
GHC library directory: CradleSuccess "/nix/store/dw33h578wv2rqcxl0yhpcrfs33p0rl2r-ghc-8.10.4-with-packages/lib/ghc-8.10.4"
GHC version:           CradleSuccess "8.10.4"
Config Location:       /home/romain/Code/skeleton/hie.yaml
Cradle:                Cradle {cradleRootDir = "/home/romain/Code/skeleton", cradleOptsProg = CradleAction: Multi}
Dependencies:

hie-bios check backend/package-b/src/Lib2.hs doesn't output anything

[fendor]

Just checking, your build process, e.g. bazel build works as expected?

I checked with just base flags, e.g.

> ghc -package-id base-4.14.1.0 -package-id base-4.14.1.0  -optc-fno-stack-protector -ibackend/package-b/ -ibackend/package-a/ backend/package-b/src/Lib2.hs backend/package-a/src/Main.hs -Wwarn

which worked fine. Deleting all these -pgma, -pgml and -ibazel-out worked fine for me.

Going to try reproduce later with bazel.

[aveltras]

bazel build //backend/package-a:exe works fine bazel build //backend/package-b:lib works fine bazel run //:hie-bios correctly enters ghci with Main and Lib2 loaded

[aveltras]

Replacing the .hie-bios content with:

#!/usr/bin/env bash
set -euo pipefail
# bazel build :hie-bios --output_groups=hie_bios --experimental_show_artifacts
# cat bazel-bin/hie-bios@hie-bios >"$HIE_BIOS_OUTPUT"
cat debug.txt >"$HIE_BIOS_OUTPUT"
# Make warnings non-fatal
echo -Wwarn >>"$HIE_BIOS_OUTPUT"

with debug.txt being

-package-id
base-4.14.1.0
-optc-fno-stack-protector
-ibackend/package-b/
-ibackend/package-a/
backend/package-b/src/Lib2.hs
backend/package-a/src/Main.hs

hie-bios check backend/package-a/src/Main.hs still fails with:

backend/package-a/src/Main.hs:3:1:Could not find module ‘Lib2’
Perhaps you meant Lib (from libiserv-8.10.4)
Use -v (or `:set -v` in ghci) to see a list of the files searched for.

Is hie-bios using the .hie-bios script or is it unrelated here ?

[fendor]

hie-bios is using .hie-bios script, but its session loading logic could be flawed... however, I assume HLS still doesn't work with that .hie-bios script?

[aveltras]

Running haskell-language-server --debug backend with the debug.txt version:

haskell-language-server version: 1.2.0.0 (GHC: 8.10.4) (PATH: /nix/store/5vkn6fdmg7xnrfvxsknj70svjx4bbnyq-haskell-language-server-1.2.0.0/bin/haskell-language-server)
 ghcide setup tester in /home/romain/Code/skeleton.
Report bugs at https://github.com/haskell/haskell-language-server/issues

Step 1/4: Finding files to test in /home/romain/Code/skeleton
Found 2 files

Step 2/4: Looking for hie.yaml files that control setup
Found 1 cradle
  (/home/romain/Code/skeleton/hie.yaml)

Step 3/4: Initializing the IDE

Step 4/4: Type checking the files
2021-07-14 12:30:47.2374253 [ThreadId 58] DEBUG hls:    hlint:getIdeas:file:NormalizedFilePath "/home/romain/Code/skeleton/backend/package-a/src/Main.hs"
2021-07-14 12:30:47.2374232 [ThreadId 57] DEBUG hls:    hlint:getIdeas:file:NormalizedFilePath "/home/romain/Code/skeleton/backend/package-b/src/Lib2.hs"
2021-07-14 12:30:47.2377998 [ThreadId 65] INFO hls:     Consulting the cradle for "backend/package-a/src/Main.hs"
Output from setting up the cradle Cradle {cradleRootDir = "/home/romain/Code/skeleton", cradleOptsProg = CradleAction: Multi}
2021-07-14 12:30:47.2839177 [ThreadId 65] DEBUG hls:    Session loading result: Right (ComponentOptions {componentOptions = ["-package-id","base-4.14.1.0","-optc-fno-stack-protector","-ibackend/package-b/","-ibackend/package-a/","backend/package-b/src/Lib2.hs","backend/package-a/src/Main.hs","-Wwarn"], componentRoot = "/home/romain/Code/skeleton", componentDependencies = []},"/nix/store/dw33h578wv2rqcxl0yhpcrfs33p0rl2r-ghc-8.10.4-with-packages/lib/ghc-8.10.4")
2021-07-14 12:30:47.3251764 [ThreadId 65] INFO hls:     Using interface files cache dir: /home/romain/.cache/ghcide/main-b50e6dc02bf5c2d0a6f341cde882f1c2a3f576fc
2021-07-14 12:30:47.3253269 [ThreadId 65] INFO hls:     Making new HscEnv[main]
2021-07-14 12:30:47.3332828 [ThreadId 65] DEBUG hls:    New Component Cache HscEnvEq: (([],Just HscEnvEq 5),fromList [("/home/romain/Code/skeleton/hie.yaml",Just 2021-07-14 08:53:54.47 UTC)])
2021-07-14 12:30:47.3336951 [ThreadId 65] DEBUG hls:    Known files updated: fromList [(TargetFile NormalizedFilePath "/home/romain/Code/skeleton/backend/package-b/src/Lib2.hs",fromList ["/home/romain/Code/skeleton/backend/package-b/src/Lib2.hs"]),(TargetFile NormalizedFilePath "/home/romain/Code/skeleton/backend/package-a/src/Main.hs",fromList ["/home/romain/Code/skeleton/backend/package-a/src/Main.hs"])]
2021-07-14 12:30:47.334249 [ThreadId 25] DEBUG hls:     Finishing build session(exception: AsyncCancelled)
2021-07-14 12:30:47.3343353 [ThreadId 65] DEBUG hls:    Restarting build session for keys [GhcSessionIO; ] (aborting the previous one took 0.00s)
2021-07-14 12:30:47.3355484 [ThreadId 124] DEBUG hls:   hlint:getIdeas:file:NormalizedFilePath "/home/romain/Code/skeleton/backend/package-a/src/Main.hs"
2021-07-14 12:30:47.335551 [ThreadId 123] DEBUG hls:    hlint:getIdeas:file:NormalizedFilePath "/home/romain/Code/skeleton/backend/package-b/src/Lib2.hs"
2021-07-14 12:30:47.3446089 [ThreadId 194] INFO hls:    File:     /home/romain/Code/skeleton/backend/package-a/src/Main.hs
Hidden:   no
Range:    3:8-3:12
Source:   not found
Severity: DsError
Message:  Could not find module ‘Lib2’Perhaps you meant Lib (from libiserv-8.10.4)
2021-07-14 12:30:47.3554499 [ThreadId 217] INFO hls:    finish: User TypeCheck (took 0.02s)
2021-07-14 12:30:47.3569664 [ThreadId 228] INFO hls:    finish: GetHie (took 0.00s)
Files that failed:
 * /home/romain/Code/skeleton/backend/package-a/src/Main.hs

Completed (1 file worked, 1 file failed)
2021-07-14 12:30:47.3571385 [ThreadId 229] INFO hls:    finish: GenerateCore (took 0.00s)

[fendor]

I did not forget this issue, I can reproduce it locally, however, I currently don't know what causes the issue :(

[aveltras]

Just mentioning @aherrmann in case he could shed some light on this. That would be a follow-up from https://github.com/tweag/rules_haskell/issues/1560