Drop compatibility with GHC 8.6.5

Author: pepeiborra

.github/workflows/flags.yml

@@ -48,7 +48,6 @@ jobs:
              , "9.0.2"
              , "8.10.7"
              , "8.8.4"
-             , "8.6.5"
              ]
         os: [ "ubuntu-latest"
             ]

.github/workflows/test.yml

@@ -62,7 +62,6 @@ jobs:
              , "9.0.2"
              , "8.10.7"
              , "8.8.4"
-             , "8.6.5"
              ]
         os: [ "ubuntu-latest"
             , "macOS-latest"
@@ -81,9 +80,6 @@ jobs:
            - os: ubuntu-latest
              ghc: '8.8.4'
              test: true
-           - os: ubuntu-latest
-             ghc: '8.6.5'
-             test: true
            - os: windows-latest
              ghc: '9.2.3'
              test: true
@@ -93,9 +89,6 @@ jobs:
            - os: windows-latest
              ghc: '8.10.7'
              test: true
-           - os: windows-latest
-             ghc: '8.6.5'
-             test: true
            # only build rest of supported ghc versions for windows
            - os: windows-latest
              ghc: '8.8.4'

.gitpod.Dockerfile

@@ -7,7 +7,6 @@ RUN sudo install-packages build-essential curl libffi-dev libffi7 libgmp-dev lib
     echo 'export PATH=$HOME/.cabal/bin:$HOME/.local/bin:$PATH' >> $HOME/.bashrc && \
     . /home/gitpod/.ghcup/env && \
     # Install all verions of GHC that HLS supports. Putting GHC into Docker image makes workspace start much faster.
-    ghcup install ghc 8.6.5 && \
     ghcup install ghc 8.8.4 && \
     ghcup install ghc 8.10.7 && \
     ghcup install ghc 9.0.2 && \

ghcide/ghcide.cabal

@@ -13,7 +13,7 @@ description:
     A library for building Haskell IDE's on top of the GHC API.
 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 == 8.6.5 || == 8.8.4 || == 8.10.7 || == 9.0.2 || == 9.2.2 || == 9.2.3
+tested-with:        GHC == 8.8.4 || == 8.10.7 || == 9.0.2 || == 9.2.2 || == 9.2.3
 extra-source-files: README.md CHANGELOG.md
                     test/data/**/*.project
                     test/data/**/*.cabal

haskell-language-server.cabal

@@ -14,7 +14,7 @@ copyright:          The Haskell IDE Team
 license:            Apache-2.0
 license-file:       LICENSE
 build-type:         Simple
-tested-with:        GHC == 8.6.5 || == 8.8.4 || == 8.10.7 || == 9.0.2 || == 9.2.2 || == 9.2.3
+tested-with:        GHC == 8.8.4 || == 8.10.7 || == 9.0.2 || == 9.2.2 || == 9.2.3
 extra-source-files:
   README.md
   ChangeLog.md

hls-graph/src/Development/IDE/Graph/Internal/Types.hs

@@ -13,9 +13,7 @@ module Development.IDE.Graph.Internal.Types where
 import           Control.Applicative
 import           Control.Monad.Catch
 #if __GLASGOW_HASKELL__ < 808
--- Needed in GHC 8.6.5
 import           Control.Concurrent.STM.Stats  (TVar, atomically)
-import           Control.Monad.Fail
 #else
 import           GHC.Conc                      (TVar, atomically)
 #endif