• Similar issue to Support for GHC-9.0 #297
• There is a work in progress by @fendor started with Drop ghc-api-compat from dependency closure #2128 although it still does not add initial support, only preparing it (maybe @fendor could tell us more about)

State of support

• The core functionality of haskell-language-server is supported via ghcide.
• Plugins and formatters needs to be updated to make it work with ghc-9.0.1 so they are not included until then.
• So you should consider use other ghc version only if you are specially interested in those plugins o formatters
• The plan is include a prebuilt executable for ghc-9.2.1 in the next hls release (1.6.0)

Has ghc-9.2.1 support

• ghcide
• haskell-language-server
• hls-haddock-comments-plugin
• hls-hlint-plugin
• hls-pragmas-plugin
• hls-retrie-plugin without test, not included via flags
• hls-eval-plugin
• hls-module-name-plugin: it was not being tested in ci: see More work around next ghc-9.2.1 support #2587. Doesnt compile for ghc-9.2.1. Fixed with Fix module-name plugin on ghc-9.2.1 #2594
• hls-class-plugin
• hls-refine-imports-plugin: [ghc-9.2] Fix refine-imports plugin #2601
• hls-splice-plugin
• hls-tactic-plugin
• hls-explicit-imports-plugin
• hls-call-hierarchy-plugin it is being tested so it works but it is not included in hls via flags: see More work around next ghc-9.2.1 support #2587
• hls-alternate-number-format-plugin
• hls-qualify-imported-names-plugin: [ghc-9.2] Fix qualify-imported-names plugin #2600

Formatters

• hls-floskell-plugin
• hls-ormolu-plugin
• hls-fourmolu-plugin
• hls-brittany-plugin
• hls-stylish-haskell-plugin

Build system and CI

• included in github release
  • .github/workflows/build.yml
• hackage release with support for ghc-9.2.1: Make work stack-9.2.1.yaml and enable pedantic (-WError) for cabal  #2606
  • .github/workflows/hackage.yml
• stack-9.2.1.yaml, added but not working
  • .circleci/config.yml
• cabal-ghc921.project - Used for disabling the not yet working plugins and fetching upstream patches
• nix support: with Flake ghc 92 #2621
  • ./configuration-ghc-921.nix
  • update .github/workflows/nix.yml
• .github/workflows/test.yml - Uses the custom cabal.project and disables tests for non-working plugins. Needs to be updated when more plugins get ghc-9.2.1 support

Dependencies which needs updates and hackage release

• TODO: track all dependencies with issues(prs taking as base the allow-newer field of cabal-ghc921.project