Drop support for GHC 8.10

Per our support policy, we should now deprecated 8.10. We might not want
to do this immediately, but this PR implements it.

TODO:
- Make sure CI is still all happy
- Simplify a lot of bindings that can now just be re-exports

Author: michaelpj

.github/workflows/bench.yml

@@ -46,7 +46,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ghc: ['8.10.7', '9.2.5']
+        ghc: ['9.2.5', '9.4.3']
         os: [ubuntu-latest]
 
     # This code is fitted to the strategy: assumes Linux is used ... etc,
@@ -104,7 +104,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ghc: ['8.10.7', '9.2.5']
+        ghc: ['9.2.5', '9.4.3']
         os: [ubuntu-latest]
         cabal: ['3.6']
         example: ['cabal', 'lsp-types']

.github/workflows/caching.yml

@@ -87,7 +87,6 @@ jobs:
              , "9.2.5"
              , "9.2.4"
              , "9.0.2"
-             , "8.10.7"
              ]
         os: [ "ubuntu-latest"
             , "macOS-latest"
@@ -113,7 +112,7 @@ jobs:
       # Fetching from github cache is faster than doing it from hackage
       # Sources does not change per ghc and ghc version son only doing it
       # for one matrix job (it is arbitrary)
-      - if: steps.compiled-deps.outputs.cache-hit != 'true' && runner.os == 'Linux' && matrix.ghc == '8.10.7'
+      - if: steps.compiled-deps.outputs.cache-hit != 'true' && runner.os == 'Linux' && matrix.ghc == '9.2.5'
         name: Download sources
         run: |
           cabal $cabalBuild --only-download --enable-benchmarks --enable-tests
@@ -128,7 +127,7 @@ jobs:
       # We build ghcide with benchs and test enabled to include its dependencies in the cache
       # (including shake-bench)
       # Only for the same ghc and os used in the bench workflow, so we save cache space
-      - if: steps.compiled-deps.outputs.cache-hit != 'true' && runner.os == 'Linux' && matrix.ghc == '8.10.7'
+      - if: steps.compiled-deps.outputs.cache-hit != 'true' && runner.os == 'Linux' && matrix.ghc == '9.2.5'
         name: Build ghcide benchmark
         run: |
           cabal $cabalBuild ghcide --enable-benchmarks --enable-tests

.github/workflows/flags.yml

@@ -44,9 +44,9 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        ghc: [ "9.2.5"
+        ghc: [ "9.4.3"
+             , "9.2.5"
              , "9.0.2"
-             , "8.10.7"
              ]
         os: [ "ubuntu-latest"
             ]

.github/workflows/hackage.yml

@@ -40,8 +40,8 @@ jobs:
                   "hls-qualify-imported-names-plugin", "hls-code-range-plugin",
                   "hls-cabal-fmt-plugin",
                   "haskell-language-server"]
-        ghc: [ "9.0.2"
-             , "8.10.7"
+        ghc: [ "9.2.5"
+             , "9.0.2"
              ]
         exclude:
         - ghc: "9.0.2"
@@ -136,7 +136,7 @@ jobs:
           cabal haddock --haddock-for-hackage
 
       - name: "Upload package dist tarball"
-        if: steps.get-hackage-version.outputs.exists != 'true' && matrix.ghc == '8.10.7'
+        if: steps.get-hackage-version.outputs.exists != 'true' && matrix.ghc == '9.2.5'
         uses: actions/upload-artifact@v3
         with:
           name: ${{ matrix.package }}

.github/workflows/test.yml

@@ -66,7 +66,6 @@ jobs:
              , "9.2.4"
              , "9.2.3"
              , "9.0.2"
-             , "8.10.7"
              ]
         os: [ "ubuntu-latest"
             , "macOS-latest"
@@ -94,9 +93,6 @@ jobs:
            - os: ubuntu-latest
              ghc: '9.0.2'
              test: true
-           - os: ubuntu-latest
-             ghc: '8.10.7'
-             test: true
            - os: windows-latest
              ghc: '9.4.2'
              test: true
@@ -108,9 +104,6 @@ jobs:
            - os: windows-latest
              ghc: '9.0.2'
              test: true
-           - os: windows-latest
-             ghc: '8.10.7'
-             test: true
 
     steps:
       - uses: actions/checkout@v3
@@ -270,6 +263,7 @@ jobs:
         run: cabal test hls-explicit-record-fields-plugin --test-options="$TEST_OPTS" || LSP_TEST_LOG_COLOR=0 LSP_TEST_LOG_MESSAGES=true LSP_TEST_LOG_STDERR=true cabal test hls-explicit-record-fields-plugin --test-options="$TEST_OPTS"
 
       ## version needs to be limited since the tests depend on cabal-fmt which only builds using specific ghc versions
+      ## FIXME: this is unsatisfiable!
       - if: matrix.test && matrix.ghc == '8.10.7'
         name: Test hls-cabal-fmt-plugin test suite
         run: cabal test hls-cabal-fmt-plugin --flag=isolateTests --test-options="$TEST_OPTS" || cabal test hls-cabal-fmt-plugin --flag=isolateTests --test-options="$TEST_OPTS" || LSP_TEST_LOG_COLOR=0 LSP_TEST_LOG_MESSAGES=true LSP_TEST_LOG_STDERR=true cabal test hls-cabal-fmt-plugin --flag=isolateTests --test-options="$TEST_OPTS"

.gitlab/tar.sh

@@ -10,7 +10,7 @@ source "$CI_PROJECT_DIR/.gitlab/setup.sh"
 case "${TARBALL_EXT}" in
     zip)
     TARBALL_PREFIX="haskell-language-server"
-		HLS_VERSION="$("$CI_PROJECT_DIR/out/haskell-language-server-8.10.7" --numeric-version)"
+		HLS_VERSION="$("$CI_PROJECT_DIR/out/haskell-language-server-9.2.5" --numeric-version)"
 		cd out/
         zip "${TARBALL_PREFIX}-${HLS_VERSION}-${TARBALL_ARCHIVE_SUFFIX}.zip" haskell-language-server-*
 		find . -type f ! -name '*.zip' -delete

docs/contributing/plugin-tutorial.md

@@ -34,7 +34,7 @@ And here is the gist of the algorithm:
 
 ## Setup
 
-To get started, let’s fetch the HLS repo and build it. You need at least GHC 8.10 for this:
+To get started, let’s fetch the HLS repo and build it. You need at least GHC 9.0 for this:
 
 ```
 git clone --recursive http://github.com/haskell/haskell-language-server hls

docs/support/ghc-version-support.md

@@ -26,7 +26,7 @@ Support status (see the support policy below for more details):
 | 9.2.(1,2)    | [1.7.0.0](https://github.com/haskell/haskell-language-server/releases/tag/1.7.0.0) | deprecated                                                                  |
 | 9.0.2        | [latest](https://github.com/haskell/haskell-language-server/releases/latest)       | full support                                                                |
 | 9.0.1        | [1.6.1.0](https://github.com/haskell/haskell-language-server/releases/tag/1.6.1.0) | deprecated                                                                  |
-| 8.10.7       | [latest](https://github.com/haskell/haskell-language-server/releases/latest)       | full support                                                                |
+| 8.10.7       | [1.9.0.0](https://github.com/haskell/haskell-language-server/releases/tag/1.9.0.0) | deprecated |
 | 8.10.6       | [1.6.1.0](https://github.com/haskell/haskell-language-server/releases/tag/1.6.1.0) | deprecated                                                                  |
 | 8.10.5       | [1.5.1](https://github.com/haskell/haskell-language-server/releases/tag/1.5.1)     | deprecated                                                                  |
 | 8.10.(4,3,2) | [1.4.0](https://github.com/haskell/haskell-language-server/releases/tag/1.4.0)     | deprecated                                                                  |

docs/troubleshooting.md

@@ -185,7 +185,7 @@ stack install haskell-language-server
 You also can leverage `ghcup compile hls`:
 
 ```bash
-ghcup compile hls -v 1.6.1.0 --ghc 8.10.7
+ghcup compile hls -v 1.9.0.0 --ghc 9.2.5
 ```
 
 ### Preprocessors

ghcide-bench/ghcide-bench.cabal

@@ -12,7 +12,7 @@ synopsis:           An LSP client for running performance experiments on HLS
 description:        An LSP client for running performance experiments on HLS
 homepage:           https://github.com/haskell/haskell-language-server/tree/master/ghcide#readme
 bug-reports:        https://github.com/haskell/haskell-language-server/issues
-tested-with:        GHC == 8.10.7 || == 9.0.2 || == 9.2.5
+tested-with:        GHC == 9.0.2 || == 9.2.5
 
 source-repository head
     type:     git