Remove unused LANGUAGE pragmas

.hlint.yaml

@@ -29,7 +29,6 @@
 - ignore: {name: "Redundant return"} # 9 hints
 - ignore: {name: "Replace case with fromMaybe"} # 6 hints
 - ignore: {name: "Replace case with maybe"} # 10 hints
-- ignore: {name: "Unused LANGUAGE pragma"} # 168 hints
 - ignore: {name: "Use $>"} # 5 hints
 - ignore: {name: "Use ++"} # 4 hints
 - ignore: {name: "Use :"} # 30 hints
@@ -96,9 +95,21 @@
 
 - arguments:
     - --ignore-glob=Cabal-syntax/src/Distribution/Fields/Lexer.hs
+    - --ignore-glob=cabal-testsuite/PackageTests/BuildWays/q/app/Main.hs
     - --ignore-glob=cabal-testsuite/PackageTests/CmmSources/src/Demo.hs
     - --ignore-glob=cabal-testsuite/PackageTests/CmmSourcesDyn/src/Demo.hs
     - --ignore-glob=cabal-testsuite/PackageTests/CmmSourcesExe/src/Demo.hs
+    - --ignore-glob=cabal-testsuite/PackageTests/NewBuild/CmdRun/Script/script.hs
+    - --ignore-glob=cabal-testsuite/PackageTests/NewBuild/CmdRun/ScriptLiterate/script.lhs
+    - --ignore-glob=cabal-testsuite/PackageTests/Regression/T5309/lib/Bio/Character/Exportable/Class.hs
+    - --ignore-glob=cabal-testsuite/PackageTests/SetupHooks/SetupHooksC2HsRules/SetupHooks.hs
+    - --ignore-glob=cabal-testsuite/PackageTests/SetupHooks/SetupHooksDuplicateRuleId/SetupHooks.hs
+    - --ignore-glob=cabal-testsuite/PackageTests/SetupHooks/SetupHooksInvalidRuleOutputIndex/SetupHooks.hs
+    - --ignore-glob=cabal-testsuite/PackageTests/SetupHooks/SetupHooksRuleOrdering/SetupHooks.hs
+    - --ignore-glob=cabal-testsuite/PackageTests/SetupHooks/SetupHooksUnusedRules/SetupHooks.hs
+    - --ignore-glob=cabal-testsuite/PackageTests/TemplateHaskell/dynamic/TH.hs
+    - --ignore-glob=cabal-testsuite/PackageTests/TemplateHaskell/profiling/TH.hs
+    - --ignore-glob=cabal-testsuite/PackageTests/TemplateHaskell/vanilla/TH.hs
     - --ignore-glob=templates/Paths_pkg.template.hs
     - --ignore-glob=templates/SPDX.LicenseExceptionId.template.hs
     - --ignore-glob=templates/SPDX.LicenseId.template.hs

Cabal-QuickCheck/src/Test/QuickCheck/Instances/Cabal.hs

@@ -1,5 +1,4 @@
 {-# LANGUAGE CPP           #-}
-{-# LANGUAGE TypeOperators #-}
 {-# LANGUAGE FlexibleInstances #-}
 {-# OPTIONS_GHC -fno-warn-orphans #-}
 module Test.QuickCheck.Instances.Cabal () where

Cabal-described/src/Distribution/Utils/GrammarRegex.hs

@@ -1,5 +1,3 @@
-{-# LANGUAGE DeriveFoldable      #-}
-{-# LANGUAGE DeriveFunctor       #-}
 {-# LANGUAGE DeriveTraversable   #-}
 {-# LANGUAGE OverloadedStrings   #-}
 {-# LANGUAGE ScopedTypeVariables #-}

Cabal-hooks/src/Distribution/Simple/SetupHooks.hs

@@ -2,12 +2,8 @@
 {-# LANGUAGE CPP #-}
 {-# LANGUAGE DerivingStrategies #-}
 {-# LANGUAGE DuplicateRecordFields #-}
-{-# LANGUAGE GeneralizedNewtypeDeriving #-}
 {-# LANGUAGE RankNTypes #-}
-{-# LANGUAGE RecursiveDo #-}
 {-# LANGUAGE StaticPointers #-}
-{-# LANGUAGE TupleSections #-}
-{-# LANGUAGE OverloadedStrings #-}
 
 {-|
 Module: Distribution.Simple.SetupHooks

Cabal-syntax/src/Distribution/Backpack.hs

@@ -1,8 +1,6 @@
 {-# LANGUAGE DeriveDataTypeable #-}
 {-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE FlexibleInstances #-}
-{-# LANGUAGE GeneralizedNewtypeDeriving #-}
-{-# LANGUAGE PatternGuards #-}
 {-# LANGUAGE RankNTypes #-}
 
 -- | This module defines the core data types for Backpack.  For more

Cabal-syntax/src/Distribution/Compat/Binary.hs

@@ -1,5 +1,4 @@
 {-# LANGUAGE CPP #-}
-{-# LANGUAGE PatternSynonyms #-}
 
 module Distribution.Compat.Binary
   ( decodeOrFailIO

Cabal-syntax/src/Distribution/Compiler.hs

@@ -1,6 +1,4 @@
 {-# LANGUAGE DeriveDataTypeable #-}
-{-# LANGUAGE DeriveFoldable #-}
-{-# LANGUAGE DeriveFunctor #-}
 {-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE DeriveTraversable #-}
 

Cabal-syntax/src/Distribution/FieldGrammar/Newtypes.hs

@@ -1,8 +1,8 @@
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE FlexibleInstances #-}
-{-# LANGUAGE FunctionalDependencies #-}
 {-# LANGUAGE InstanceSigs #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE RankNTypes #-}
 {-# LANGUAGE ScopedTypeVariables #-}

Cabal-syntax/src/Distribution/Fields/Field.hs

@@ -1,6 +1,4 @@
 {-# LANGUAGE CPP #-}
-{-# LANGUAGE DeriveFoldable #-}
-{-# LANGUAGE DeriveFunctor #-}
 {-# LANGUAGE DeriveTraversable #-}
 {-# LANGUAGE StandaloneDeriving #-}
 

Cabal-syntax/src/Distribution/Fields/Parser.hs

@@ -1,7 +1,6 @@
 {-# LANGUAGE CPP #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE OverloadedStrings #-}
-{-# LANGUAGE PatternGuards #-}
 
 -----------------------------------------------------------------------------
 

Cabal-syntax/src/Distribution/Fields/Pretty.hs

@@ -1,6 +1,4 @@
 {-# LANGUAGE BangPatterns #-}
-{-# LANGUAGE DeriveFoldable #-}
-{-# LANGUAGE DeriveFunctor #-}
 {-# LANGUAGE DeriveTraversable #-}
 {-# LANGUAGE LambdaCase #-}
 

Cabal-syntax/src/Distribution/Package.hs

@@ -1,7 +1,3 @@
-{-# LANGUAGE DeriveDataTypeable #-}
-{-# LANGUAGE DeriveGeneric #-}
-{-# LANGUAGE GeneralizedNewtypeDeriving #-}
-
 -----------------------------------------------------------------------------
 
 -- |

Cabal-syntax/src/Distribution/Types/AbiHash.hs

@@ -1,6 +1,5 @@
 {-# LANGUAGE DeriveDataTypeable #-}
 {-# LANGUAGE DeriveGeneric #-}
-{-# LANGUAGE GeneralizedNewtypeDeriving #-}
 
 module Distribution.Types.AbiHash
   ( AbiHash

Cabal-syntax/src/Distribution/Types/ComponentId.hs

@@ -1,6 +1,5 @@
 {-# LANGUAGE DeriveDataTypeable #-}
 {-# LANGUAGE DeriveGeneric #-}
-{-# LANGUAGE GeneralizedNewtypeDeriving #-}
 
 module Distribution.Types.ComponentId
   ( ComponentId

Cabal-syntax/src/Distribution/Types/CondTree.hs

@@ -1,6 +1,4 @@
 {-# LANGUAGE DeriveDataTypeable #-}
-{-# LANGUAGE DeriveFoldable #-}
-{-# LANGUAGE DeriveFunctor #-}
 {-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE DeriveTraversable #-}
 {-# LANGUAGE ScopedTypeVariables #-}

Cabal-syntax/src/Distribution/Types/HookedBuildInfo.hs

@@ -1,6 +1,3 @@
-{-# LANGUAGE DeriveDataTypeable #-}
-{-# LANGUAGE DeriveGeneric #-}
-
 module Distribution.Types.HookedBuildInfo
   ( HookedBuildInfo
   , emptyHookedBuildInfo

Cabal-syntax/src/Distribution/Types/Module.hs

@@ -1,6 +1,5 @@
 {-# LANGUAGE DeriveDataTypeable #-}
 {-# LANGUAGE DeriveGeneric #-}
-{-# LANGUAGE GeneralizedNewtypeDeriving #-}
 
 module Distribution.Types.Module
   ( Module (..)

Cabal-syntax/src/Distribution/Types/PackageDescription/Lens.hs

@@ -1,5 +1,4 @@
 {-# LANGUAGE DataKinds #-}
-{-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE RankNTypes #-}
 
 module Distribution.Types.PackageDescription.Lens

Cabal-syntax/src/Distribution/Types/PackageName.hs

@@ -1,6 +1,5 @@
 {-# LANGUAGE DeriveDataTypeable #-}
 {-# LANGUAGE DeriveGeneric #-}
-{-# LANGUAGE GeneralizedNewtypeDeriving #-}
 
 module Distribution.Types.PackageName
   ( PackageName

Cabal-syntax/src/Distribution/Types/PkgconfigName.hs

@@ -1,6 +1,5 @@
 {-# LANGUAGE DeriveDataTypeable #-}
 {-# LANGUAGE DeriveGeneric #-}
-{-# LANGUAGE GeneralizedNewtypeDeriving #-}
 
 module Distribution.Types.PkgconfigName
   ( PkgconfigName

Cabal-syntax/src/Distribution/Types/VersionRange/Internal.hs

@@ -1,6 +1,4 @@
 {-# LANGUAGE DeriveDataTypeable #-}
-{-# LANGUAGE DeriveFoldable #-}
-{-# LANGUAGE DeriveFunctor #-}
 {-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE DeriveTraversable #-}
 {-# LANGUAGE FlexibleContexts #-}

Cabal-syntax/src/Distribution/Utils/Generic.hs

@@ -1,6 +1,5 @@
 {-# LANGUAGE BangPatterns #-}
 {-# LANGUAGE CPP #-}
-{-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE RankNTypes #-}
 {-# LANGUAGE ScopedTypeVariables #-}

Cabal-syntax/src/Distribution/Utils/Structured.hs

@@ -2,7 +2,6 @@
 {-# LANGUAGE DefaultSignatures #-}
 {-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE FlexibleContexts #-}
-{-# LANGUAGE PatternSynonyms #-}
 {-# LANGUAGE PolyKinds #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TypeApplications #-}

Cabal-tests/tests/UnitTests/Distribution/PkgconfigVersion.hs

@@ -1,5 +1,3 @@
-{-# LANGUAGE DeriveDataTypeable #-}
-{-# LANGUAGE StandaloneDeriving #-}
 module UnitTests.Distribution.PkgconfigVersion (pkgconfigVersionTests) where
 
 import Test.Tasty

Cabal-tests/tests/UnitTests/Distribution/Version.hs

@@ -1,5 +1,3 @@
-{-# LANGUAGE DeriveDataTypeable #-}
-{-# LANGUAGE StandaloneDeriving #-}
 {-# OPTIONS_GHC -fno-warn-incomplete-patterns
                 -fno-warn-deprecations
                 -fno-warn-unused-binds #-} --FIXME

Cabal/src/Distribution/Backpack/Configure.hs

@@ -1,8 +1,6 @@
-{-# LANGUAGE DeriveDataTypeable #-}
 {-# LANGUAGE NondecreasingIndentation #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE PatternGuards #-}
-{-# LANGUAGE RecordWildCards #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TypeFamilies #-}
 {-# LANGUAGE NoMonoLocalBinds #-}
@@ -37,7 +35,7 @@ import Distribution.InstalledPackageInfo
 import qualified Distribution.InstalledPackageInfo as Installed
 import Distribution.ModuleName
 import Distribution.Package
-import Distribution.PackageDescription
+import Distribution.PackageDescription (FlagAssignment, PackageDescription (..), libName)
 import Distribution.Simple.Compiler
 import Distribution.Simple.Flag
 import Distribution.Simple.LocalBuildInfo

Cabal/src/Distribution/Backpack/ConfiguredComponent.hs

@@ -1,5 +1,3 @@
-{-# LANGUAGE PatternGuards #-}
-
 -- | See <https://github.com/ezyang/ghc-proposals/blob/backpack/proposals/0000-backpack.rst>
 module Distribution.Backpack.ConfiguredComponent
   ( ConfiguredComponent (..)

Cabal/src/Distribution/Backpack/ModuleScope.hs

@@ -1,5 +1,3 @@
-{-# LANGUAGE DeriveFoldable #-}
-{-# LANGUAGE DeriveFunctor #-}
 {-# LANGUAGE DeriveTraversable #-}
 
 -- | See <https://github.com/ezyang/ghc-proposals/blob/backpack/proposals/0000-backpack.rst>

Cabal/src/Distribution/Backpack/PreModuleShape.hs

@@ -1,4 +1,3 @@
-{-# LANGUAGE DeriveDataTypeable #-}
 {-# LANGUAGE DeriveGeneric #-}
 
 module Distribution.Backpack.PreModuleShape

Cabal/src/Distribution/PackageDescription/Check/Warning.hs

@@ -1,5 +1,4 @@
 {-# LANGUAGE DataKinds #-}
-{-# LANGUAGE GeneralizedNewtypeDeriving #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 

Cabal/src/Distribution/Simple.hs

@@ -1,8 +1,6 @@
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE FlexibleContexts #-}
-{-# LANGUAGE LambdaCase #-}
-{-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE RankNTypes #-}
 {-# LANGUAGE ScopedTypeVariables #-}

Cabal/src/Distribution/Simple/Bench.hs

@@ -1,6 +1,5 @@
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE FlexibleContexts #-}
-{-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE RankNTypes #-}
 
 -----------------------------------------------------------------------------

Cabal/src/Distribution/Simple/Build.hs

@@ -2,7 +2,6 @@
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE FlexibleContexts #-}
-{-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE RankNTypes #-}
 {-# LANGUAGE TupleSections #-}
 

Cabal/src/Distribution/Simple/Build/Inputs.hs

@@ -1,7 +1,3 @@
-{-# LANGUAGE GeneralizedNewtypeDeriving #-}
-{-# LANGUAGE NamedFieldPuns #-}
-{-# LANGUAGE PatternSynonyms #-}
-
 module Distribution.Simple.Build.Inputs
   ( -- * Inputs of actions for building components
     PreBuildComponentInputs (..)

Cabal/src/Distribution/Simple/BuildTarget.hs

@@ -2,7 +2,6 @@
 {-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE FlexibleContexts #-}
-{-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE RankNTypes #-}
 
 -----------------------------------------------------------------------------

Cabal/src/Distribution/Simple/Compiler.hs

@@ -1,7 +1,5 @@
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE DeriveDataTypeable #-}
-{-# LANGUAGE DeriveFoldable #-}
-{-# LANGUAGE DeriveFunctor #-}
 {-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE DeriveTraversable #-}
 

Cabal/src/Distribution/Simple/Errors.hs

@@ -1,5 +1,3 @@
-{-# LANGUAGE LambdaCase #-}
-
 -----------------------------------------------------------------------------
 
 -- Module      :  Distribution.Simple.Errors

Cabal/src/Distribution/Simple/Flag.hs

@@ -1,4 +1,3 @@
-{-# LANGUAGE DeriveFoldable #-}
 {-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE DeriveTraversable #-}
 {-# LANGUAGE FlexibleContexts #-}

Cabal/src/Distribution/Simple/GHC.hs

@@ -5,7 +5,6 @@
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE RankNTypes #-}
 {-# LANGUAGE ScopedTypeVariables #-}
-{-# LANGUAGE TupleSections #-}
 
 -----------------------------------------------------------------------------
 

Cabal/src/Distribution/Simple/GHC/Build/Link.hs

@@ -1,7 +1,6 @@
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE RankNTypes #-}
-{-# LANGUAGE TypeApplications #-}
 
 module Distribution.Simple.GHC.Build.Link where
 

Cabal/src/Distribution/Simple/GHC/Build/Modules.hs

@@ -1,9 +1,7 @@
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE LambdaCase #-}
-{-# LANGUAGE MultiWayIf #-}
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE RankNTypes #-}
-{-# LANGUAGE TupleSections #-}
 
 module Distribution.Simple.GHC.Build.Modules
   ( buildHaskellModules

Cabal/src/Distribution/Simple/GHC/EnvironmentParser.hs

@@ -1,9 +1,6 @@
 {-# LANGUAGE DeriveDataTypeable #-}
 {-# LANGUAGE FlexibleContexts #-}
-{-# LANGUAGE GeneralizedNewtypeDeriving #-}
-{-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE RankNTypes #-}
-{-# LANGUAGE RecordWildCards #-}
 
 module Distribution.Simple.GHC.EnvironmentParser (parseGhcEnvironmentFile, readGhcEnvironmentFile, ParseErrorExc (..)) where
 

Cabal/src/Distribution/Simple/GHCJS.hs

@@ -2,7 +2,6 @@
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE RankNTypes #-}
-{-# LANGUAGE TupleSections #-}
 
 module Distribution.Simple.GHCJS
   ( getGhcInfo

Cabal/src/Distribution/Simple/Glob.hs

@@ -1,6 +1,5 @@
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE DeriveFunctor #-}
-{-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE RankNTypes #-}
 

Cabal/src/Distribution/Simple/Glob/Internal.hs

@@ -1,6 +1,4 @@
-{-# LANGUAGE DeriveFunctor #-}
 {-# LANGUAGE DeriveGeneric #-}
-{-# LANGUAGE LambdaCase #-}
 
 -----------------------------------------------------------------------------
 

Cabal/src/Distribution/Simple/Haddock.hs

@@ -5,7 +5,6 @@
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE RankNTypes #-}
 {-# LANGUAGE ScopedTypeVariables #-}
-{-# LANGUAGE TypeApplications #-}
 
 -----------------------------------------------------------------------------
 

Cabal/src/Distribution/Simple/LocalBuildInfo.hs

@@ -1,8 +1,6 @@
 {-# LANGUAGE DataKinds #-}
-{-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE FlexibleContexts #-}
-{-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE RankNTypes #-}
 
 -----------------------------------------------------------------------------

Cabal/src/Distribution/Simple/PreProcess.hs

@@ -1,7 +1,6 @@
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE RankNTypes #-}
-{-# LANGUAGE TypeApplications #-}
 
 -----------------------------------------------------------------------------
 

Cabal/src/Distribution/Simple/Program/Find.hs

@@ -1,6 +1,4 @@
 {-# LANGUAGE CPP #-}
-{-# LANGUAGE DeriveDataTypeable #-}
-{-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE RankNTypes #-}