GHC 9.6 compatibility

- -XTypeInType is deprecated
- skip failing JS test on Windows
  Cf. https://github.com/haskell/cabal/pull/8754#issuecomment-1435535763
- deal with lift2A in Prelude since base-4.18 (GHC 9.6)
- disable everfailing Backpack tests

(cherry picked from commit 87ac1203)

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

@@ -7,7 +7,6 @@
 {-# LANGUAGE TypeFamilies        #-}
 {-# LANGUAGE TypeOperators       #-}
 {-# LANGUAGE PatternSynonyms     #-}
-{-# LANGUAGE TypeInType          #-}
 -- |
 --
 -- Copyright: (c) 2019 Oleg Grenrus

cabal-install/src/Distribution/Client/VCS.hs

+{-# LANGUAGE CPP #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE NamedFieldPuns, RecordWildCards, RankNTypes #-}
@@ -53,8 +54,11 @@ import Distribution.Version
          ( mkVersion )
 import qualified Distribution.PackageDescription as PD
 
+#if !MIN_VERSION_base(4,18,0)
 import Control.Applicative
          ( liftA2 )
+#endif
+
 import Control.Exception
          ( throw, try )
 import Control.Monad.Trans

cabal-testsuite/PackageTests/Backpack/Includes2/setup-external.test.hs

 import Test.Cabal.Prelude
 main = setupAndCabalTest $ do
   skipUnlessGhcVersion ">= 8.1"
-  ghc <- isGhcVersion "== 9.0.2 || == 9.2.* || == 9.4.*"
+  ghc <- isGhcVersion "== 9.0.2 || == 9.2.* || == 9.4.* || == 9.6.*"
   expectBrokenIf ghc 7987 $ do
     withPackageDb $ do
       withDirectory "mylib" $ setup_install_with_docs ["--ipid", "mylib-0.1.0.0"]

cabal-testsuite/PackageTests/Backpack/Includes2/setup-per-component.test.hs

@@ -2,7 +2,7 @@ import Test.Cabal.Prelude
 main = setupTest $ do
   -- No cabal test because per-component is broken with it
   skipUnlessGhcVersion ">= 8.1"
-  ghc <- isGhcVersion "== 9.0.2 || == 9.2.* || == 9.4.*"
+  ghc <- isGhcVersion "== 9.0.2 || == 9.2.* || == 9.4.* || == 9.6.*"
   expectBrokenIf ghc 7987 $
     withPackageDb $ do
       let setup_install' args = setup_install_with_docs (["--cabal-file", "Includes2.cabal"] ++ args)

cabal-testsuite/PackageTests/Backpack/Includes3/setup-external-ok.test.hs

@@ -3,7 +3,7 @@ import Data.List
 import qualified Data.Char as Char
 main = setupAndCabalTest $ do
   skipUnlessGhcVersion ">= 8.1"
-  ghc <- isGhcVersion "== 9.0.2 || == 9.2.* || == 9.4.*"
+  ghc <- isGhcVersion "== 9.0.2 || == 9.2.* || == 9.4.* || == 9.6.*"
   expectBrokenIf ghc 7987 $
     withPackageDb $ do
       containers_id <- getIPID "containers"

cabal-testsuite/PackageTests/JS/JsSources/js-arch.test.hs

@@ -3,6 +3,7 @@ import Test.Cabal.Prelude
 main = setupAndCabalTest $ do
     skipUnlessGhcVersion ">= 9.6"
     skipUnlessJavaScript
+    skipIfWindows
 
     res <- cabal' "v2-run" ["demo"]
     assertOutputContains "Hello JS!" res