Keep tests only for GHC 9

Author: berberman

.github/workflows/test.yml

@@ -170,7 +170,7 @@ jobs:
         name: Test hls-class-plugin
         run: cabal test hls-class-plugin --test-options="-j1 --rerun-update" || cabal test hls-class-plugin --test-options="-j1 --rerun" || LSP_TEST_LOG_COLOR=0 LSP_TEST_LOG_MESSAGES=true LSP_TEST_LOG_STDERR=true cabal test hls-class-plugin --test-options="-j1 --rerun"
 
-      - if: ${{ needs.pre_job.outputs.should_skip != 'true' && matrix.test }}
+      - if: ${{ needs.pre_job.outputs.should_skip != 'true' && matrix.test && matrix.ghc == '9.0.1' }}
         name: Test hls-eval-plugin
         run: cabal test hls-eval-plugin --test-options="-j1 --rerun-update" || cabal test hls-eval-plugin --test-options="-j1 --rerun" || LSP_TEST_LOG_COLOR=0 LSP_TEST_LOG_MESSAGES=true LSP_TEST_LOG_STDERR=true cabal test hls-eval-plugin --test-options="-j1 --rerun"
 

plugins/hls-eval-plugin/hls-eval-plugin.cabal

@@ -19,13 +19,13 @@ build-type:         Simple
 extra-source-files:
   LICENSE
   README.md
+  test/cabal.project
+  test/info-util/*.cabal
+  test/info-util/*.hs
   test/testdata/*.cabal
   test/testdata/*.hs
   test/testdata/*.lhs
   test/testdata/*.yaml
-  test/info-util/*.cabal
-  test/info-util/*.hs
-  test/cabal.project
 
 flag pedantic
   description: Enable -Werror
@@ -94,19 +94,21 @@ library
     DataKinds
     TypeOperators
 
-test-suite tests
-  type:             exitcode-stdio-1.0
-  default-language: Haskell2010
-  hs-source-dirs:   test
-  main-is:          Main.hs
-  ghc-options:      -threaded -rtsopts -with-rtsopts=-N
-  build-depends:
-    , aeson
-    , base
-    , directory
-    , extra
-    , filepath
-    , hls-eval-plugin
-    , hls-test-utils   ^>=1.0
-    , lens
-    , lsp-types
+-- test suites are only available in GHC 9
+if impl(ghc >=9.0)
+  test-suite tests
+    type:             exitcode-stdio-1.0
+    default-language: Haskell2010
+    hs-source-dirs:   test
+    main-is:          Main.hs
+    ghc-options:      -threaded -rtsopts -with-rtsopts=-N
+    build-depends:
+      , aeson
+      , base
+      , directory
+      , extra
+      , filepath
+      , hls-eval-plugin
+      , hls-test-utils   ^>=1.0
+      , lens
+      , lsp-types