Ban new uses of tail (#2634)

Co-authored-by: Javier Neira <[email protected]>

Author: mxxun

ghcide/.hlint.yaml

@@ -139,6 +139,21 @@
   - {name: unsafeCoerce, within: [Ide.Plugin.Eval.Code, Development.IDE.Core.Compile, Development.IDE.Types.Shake]}
   # Things that are a bit dangerous in the GHC API
   - {name: nameModule, within: []}
+  # Partials and their legacy locations
+  - name: tail
+    within:
+    - Development.Benchmark.Rules
+    - Development.IDE.Plugin.CodeAction
+    - Development.IDE.Plugin.CodeAction.ExactPrint
+    - Development.IDE.Session
+    # ghcide/test/exe
+    - Main
+    # plugins/hls-tactics-plugin/test
+    # - UnificationSpec
+
+# We really do not want novel usages of restricted functions, and mere
+# Warning is not enough to prevent those consistently; you need a build failure.
+- error: {name: Avoid restricted function}
 
 # Add custom hints for this project
 #