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-- | A test for ensuring that GHC's supporting language extensions remains in
-- sync with Cabal's own extension list.
--
-- If you have ended up here due to a test failure, please see
-- Note [Adding a language extension] in compiler/GHC/Driver/Session.hs.
module Main (main) where
import Control.Monad
import Data.List ( (\\) )
import GHC.Driver.Session
import Language.Haskell.Extension
main :: IO ()
main = do
let ghcExtensions = map flagSpecName xFlags
cabalExtensions = map show [ toEnum 0 :: KnownExtension .. ]
ghcOnlyExtensions = ghcExtensions \\ cabalExtensions
cabalOnlyExtensions = cabalExtensions \\ ghcExtensions
check "GHC-only flags" expectedGhcOnlyExtensions ghcOnlyExtensions
check "Cabal-only flags" expectedCabalOnlyExtensions cabalOnlyExtensions
check :: String -> [String] -> [String] -> IO ()
check title expected got
= do let unexpected = got \\ expected
missing = expected \\ got
showProblems problemType problems
= unless (null problems) $
do putStrLn (title ++ ": " ++ problemType)
putStrLn "-----"
mapM_ putStrLn problems
putStrLn "-----"
putStrLn ""
showProblems "Unexpected flags" unexpected
showProblems "Missing flags" missing
-- See Note [Adding a language extension] in compiler/GHC/Driver/Session.hs.
expectedGhcOnlyExtensions :: [String]
expectedGhcOnlyExtensions =
[ "TypeAbstractions",
"ExtendedLiterals"
]
expectedCabalOnlyExtensions :: [String]
expectedCabalOnlyExtensions = ["Generics",
"ExtensibleRecords",
"RestrictedTypeSynonyms",
"HereDocuments",
"NewQualifiedOperators",
"XmlSyntax",
"RegularPatterns",
"SafeImports",
"Safe",
"Unsafe",
"Trustworthy",
"MonadFailDesugaring",
"MonoPatBinds",
-- https://github.com/haskell/cabal/pull/8521
"RequiredTypeArguments"
]
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