himportscan upgrade for GHC 9.6

[wavewave]

this is on top of #59. rebased.

[avdv]

@Mergifyio rebase

[mergify]

rebase

❌ Pull request can't be updated with latest base branch changes

Mergify needs the author permission to update the base branch of the pull request.
@MercuryTechnologies needs to authorize modification on its head branch.

[avdv]

Thank you! Could you also add an entry to the CircleCI job matrix for GHC 9.6 please?

[avdv]

@wavewave Oh, you also need to add a stack config for 9.6.2. And a lock file for it. Do you know how or should I add this?

[wavewave]

Ah. thanks. Just saw your message here. actually, I don't know how to add that snapshot-*.json file. Could you inform me the command? thanks!

[wavewave]

now i read rules_haskell documentation and seems like

bazel run @stackage-unpinned//:pin

was the command to generate. :-)

[wavewave]

Ok. the missing snapshot file problem got solved but now I have this.. 🤔

ERROR: /home/runner/.cache/bazel/_bazel_runner/2f1e0776f91a8e59682a44ab965a403c/external/stackage/BUILD.bazel:623:26: in haskell_toolchain_library rule @stackage//:template-haskell: 
Traceback (most recent call last):
	File "/home/runner/.cache/bazel/_bazel_runner/2f1e0776f91a8e59682a44ab965a403c/external/rules_haskell/haskell/private/haskell_impl.bzl", line 805, column 13, in haskell_toolchain_library_impl
		fail(
Error in fail: 
template-haskell is not a toolchain library.
Check that it ships with your version of GHC.
The following toolchain libraries are available:
{}

[avdv]

Ok. the missing snapshot file problem got solved but now I have this.. 🤔

ERROR: /home/runner/.cache/bazel/_bazel_runner/2f1e0776f91a8e59682a44ab965a403c/external/stackage/BUILD.bazel:623:26: in haskell_toolchain_library rule @stackage//:template-haskell: 
Traceback (most recent call last):
	File "/home/runner/.cache/bazel/_bazel_runner/2f1e0776f91a8e59682a44ab965a403c/external/rules_haskell/haskell/private/haskell_impl.bzl", line 805, column 13, in haskell_toolchain_library_impl
		fail(
Error in fail: 
template-haskell is not a toolchain library.
Check that it ships with your version of GHC.
The following toolchain libraries are available:
{}

This is tweag/rules_haskell#1920 which has been fixed in rules_haskell 0.18.

[wavewave]

Thanks! updated rules_haskell to 0.18.

[wavewave]

Certainly Cabal specified in the snapshot (tweag/cabal 4f8c4ab) is not compatible with GHC 9.6. I am not familiar with the modification needed (first of all, why should we use a custom version of Cabal?). Would you check whether there is a working version (or whether needed for a special Cabal)? BTW, on my project, it was working with stock Cabal on GHC 9.6.

[avdv]

Certainly Cabal specified in the snapshot (tweag/cabal 4f8c4ab) is not compatible with GHC 9.6. I am not familiar with the modification needed (first of all, why should we use a custom version of Cabal?). Would you check whether there is a working version (or whether needed for a special Cabal)? BTW, on my project, it was working with stock Cabal on GHC 9.6.

This is related to a problem in Cabal (see tweag/rules_haskell#1832) which has been fixed in Cabal 3.10.1. GHC >= 9.6 includes a recent enough version of Cabal so we don't need the workaround anymore.