Only build the plugin-tutorial with GHC 9.6 and 9.8

Author: fendor

.github/workflows/test.yml

@@ -255,7 +255,9 @@ jobs:
         name: Test hls-notes-plugin test suite
         run: cabal test hls-notes-plugin-tests || cabal test hls-notes-plugin-tests
 
-      - if: matrix.test
+      # The plugin tutorial is only compatible with 9.6 and 9.8.
+      # No particular reason, just to avoid excessive CPP.
+      - if: matrix.test && matrix.ghc != '9.4' && matrix.ghc != '9.10' && matrix.ghc != '9.12'
         name: Compile the plugin-tutorial
         run: cabal build plugin-tutorial
 

haskell-language-server.cabal

@@ -2268,6 +2268,12 @@ test-suite ghcide-bench-test
 
 executable plugin-tutorial
   import: defaults
+  -- The plugin tutorial is only compatible with 9.6 and 9.8.
+  -- No particular reason, just to avoid excessive CPP.
+  if (impl(ghc >= 9.6) && impl(ghc < 9.10))
+    buildable: True
+  else
+    buildable: False
   ghc-options: -pgmL markdown-unlit
   main-is: docs/contributing/plugin-tutorial.lhs
   build-tool-depends: markdown-unlit:markdown-unlit