Remove same-package import lists, fixes #2835.

Instead of qualifying, in some cases I just added an extra
'hiding' pragma to squelch errors.  Common conflicts
(just grep for hiding):

    - Flag
        - Distribution.Simple.Compiler
        - Distribution.PackageDescription
        - Distribution.Simple.Setup
    - installedComponentId
        - Distribution.Package
        - Distribution.InstalledPackageInfo
    - doesFileExist
        - Distribution.PackageDescription.Check
    - instantiatedWith
        - I renamed the field in InstalledPackageInfo.  But
          it's probably going away with Backpack bits; I
          migth just excise it soon.
    - absoluteInstallDirs and substPathTemplate
        - Distribution.Simple.InstallDirs
        - Distribution.Simple.LocalBuildInfo

I fixed some shadowing errors by renaming local variables in some cases.
Common shadowings (we should perhaps consider not using these as
method/field names):

    - freeVars
    - components
    - noVersion
    - verbosity
    - get
    - description
    - name

Some data structures were moved around (IPIConvert and ABIHash)
to make it easier to handle import lists.

Some functions in Utils could be turned into reexports of standard
library functions.

No explicit imports were removed from non-Cabal imports.  These
imports help maintain warning cleanliness across versions of GHC,
so I don't recommend removing them.
Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Cabal/Cabal.cabal

@@ -265,6 +265,7 @@ library
     Distribution.Simple.GHC.Internal
     Distribution.Simple.GHC.IPI641
     Distribution.Simple.GHC.IPI642
+    Distribution.Simple.GHC.IPIConvert
     Distribution.Simple.GHC.ImplInfo
     Paths_Cabal
 

Cabal/Distribution/Compat/CopyFile.hs

@@ -11,20 +11,18 @@ module Distribution.Compat.CopyFile (
   setDirOrdinary,
   ) where
 
+import Distribution.Compat.Exception
+import Distribution.Compat.Internal.TempFile
 
 import Control.Monad
          ( when, unless )
 import Control.Exception
          ( bracketOnError, throwIO )
 import qualified Data.ByteString.Lazy as BSL
-import Distribution.Compat.Exception
-         ( catchIO )
 import System.IO.Error
          ( ioeSetLocation )
 import System.Directory
          ( doesFileExist, renameFile, removeFile )
-import Distribution.Compat.Internal.TempFile
-         ( openBinaryTempFile )
 import System.FilePath
          ( takeDirectory )
 import System.IO

Cabal/Distribution/Compat/Internal/TempFile.hs

@@ -7,6 +7,7 @@ module Distribution.Compat.Internal.TempFile (
   createTempDirectory,
   ) where
 
+import Distribution.Compat.Exception
 
 import System.FilePath        ((</>))
 import Foreign.C              (CInt, eEXIST, getErrno, errnoToIOError)
@@ -18,7 +19,6 @@ import System.Posix.Internals (c_open, c_close, o_CREAT, o_EXCL, o_RDWR,
                                withFilePath, c_getpid)
 import System.IO.Error        (isAlreadyExistsError)
 import GHC.IO.Handle.FD       (fdToHandle)
-import Distribution.Compat.Exception (tryIO)
 import Control.Exception      (onException)
 
 #if defined(mingw32_HOST_OS) || defined(ghcjs_HOST_OS)

Cabal/Distribution/Compiler.hs

@@ -42,15 +42,15 @@ module Distribution.Compiler (
   AbiTag(..), abiTagString
   ) where
 
-import Distribution.Compat.Binary (Binary)
+import Distribution.Compat.Binary
+import Language.Haskell.Extension
+
 import Data.Data (Data)
 import Data.Typeable (Typeable)
 import Data.Maybe (fromMaybe)
 import Distribution.Version (Version(..))
 import GHC.Generics (Generic)
 
-import Language.Haskell.Extension (Language, Extension)
-
 import qualified System.Info (compilerName, compilerVersion)
 import Distribution.Text (Text(..), display)
 import qualified Distribution.Compat.ReadP as Parse

Cabal/Distribution/InstalledPackageInfo.hs

@@ -27,7 +27,6 @@
 -- This module is meant to be local-only to Distribution...
 
 module Distribution.InstalledPackageInfo (
-        AbiHash(..),
         InstalledPackageInfo(..),
         OriginalModule(..), ExposedModule(..),
         ParseResult(..), PError(..), PWarning,
@@ -40,32 +39,18 @@ module Distribution.InstalledPackageInfo (
   ) where
 
 import Distribution.ParseUtils
-         ( FieldDescr(..), ParseResult(..), PError(..), PWarning
-         , simpleField, listField, parseLicenseQ
-         , showFields, showSingleNamedField, showSimpleSingleNamedField
-         , parseFieldsFlat
-         , parseFilePathQ, parseTokenQ, parseModuleNameQ, parsePackageNameQ
-         , showFilePath, showToken, boolField, parseOptVersion
-         , parseFreeText, showFreeText, parseOptCommaList )
-import Distribution.License     ( License(..) )
-import Distribution.Package
-         ( PackageName(..), PackageIdentifier(..)
-         , PackageId, ComponentId(..)
-         , packageName, packageVersion, ComponentId(..) )
+import Distribution.License
+import Distribution.Package hiding (installedComponentId)
 import qualified Distribution.Package as Package
 import Distribution.ModuleName
-         ( ModuleName )
 import Distribution.Version
-         ( Version(..) )
 import Distribution.Text
-         ( Text(disp, parse) )
-import Text.PrettyPrint as Disp
 import qualified Distribution.Compat.ReadP as Parse
+import Distribution.Compat.Binary
 
-import Distribution.Compat.Binary  (Binary)
+import Text.PrettyPrint as Disp
 import Data.Maybe   (fromMaybe)
 import GHC.Generics (Generic)
-import qualified Data.Char as Char
 
 -- -----------------------------------------------------------------------------
 -- The InstalledPackageInfo type
@@ -92,7 +77,7 @@ data InstalledPackageInfo
         abiHash           :: AbiHash,
         exposed           :: Bool,
         exposedModules    :: [ExposedModule],
-        instantiatedWith  :: [(ModuleName, OriginalModule)],
+        installedInstantiatedWith  :: [(ModuleName, OriginalModule)],
         hiddenModules     :: [ModuleName],
         trusted           :: Bool,
         importDirs        :: [FilePath],
@@ -128,7 +113,7 @@ instance Package.PackageInstalled InstalledPackageInfo where
 emptyInstalledPackageInfo :: InstalledPackageInfo
 emptyInstalledPackageInfo
    = InstalledPackageInfo {
-        sourcePackageId    = PackageIdentifier (PackageName "") noVersion,
+        sourcePackageId    = PackageIdentifier (PackageName "") (Version [] []),
         installedComponentId         = ComponentId "",
         compatPackageKey   = ComponentId "",
         license           = UnspecifiedLicense,
@@ -145,7 +130,7 @@ emptyInstalledPackageInfo
         exposed           = False,
         exposedModules    = [],
         hiddenModules     = [],
-        instantiatedWith  = [],
+        installedInstantiatedWith  = [],
         trusted           = False,
         importDirs        = [],
         libraryDirs       = [],
@@ -165,20 +150,6 @@ emptyInstalledPackageInfo
         pkgRoot           = Nothing
     }
 
-noVersion :: Version
-noVersion = Version [] []
-
--- -----------------------------------------------------------------------------
--- Exposed modules
-
-newtype AbiHash = AbiHash String
-    deriving (Eq, Show, Read, Generic)
-instance Binary AbiHash
-
-instance Text AbiHash where
-    disp (AbiHash abi) = Disp.text abi
-    parse = fmap AbiHash (Parse.munch Char.isAlphaNum)
-
 -- -----------------------------------------------------------------------------
 -- Exposed modules
 
@@ -348,7 +319,7 @@ installedFieldDescrs = [
         abiHash            (\abi    pkg -> pkg{abiHash=abi})
  , listField   "instantiated-with"
         showInstantiatedWith parseInstantiatedWith
-        instantiatedWith   (\xs    pkg -> pkg{instantiatedWith=xs})
+        installedInstantiatedWith   (\xs    pkg -> pkg{installedInstantiatedWith=xs})
  , boolField   "trusted"
         trusted            (\val pkg -> pkg{trusted=val})
  , listField   "import-dirs"

Cabal/Distribution/License.hs

@@ -47,13 +47,13 @@ module Distribution.License (
     knownLicenses,
   ) where
 
-import Distribution.Version (Version(Version))
-
-import Distribution.Text (Text(..), display)
+import Distribution.Version
+import Distribution.Text
 import qualified Distribution.Compat.ReadP as Parse
+import Distribution.Compat.Binary
+
 import qualified Text.PrettyPrint as Disp
 import Text.PrettyPrint ((<>))
-import Distribution.Compat.Binary (Binary)
 import qualified Data.Char as Char (isAlphaNum)
 import Data.Data (Data)
 import Data.Typeable (Typeable)

Cabal/Distribution/Make.hs

@@ -62,22 +62,19 @@ module Distribution.Make (
 
 -- local
 import Distribution.Compat.Exception
-import Distribution.Package --must not specify imports, since we're exporting moule.
-import Distribution.Simple.Program(defaultProgramConfiguration)
+import Distribution.Package
+import Distribution.Simple.Program
 import Distribution.PackageDescription
 import Distribution.Simple.Setup
 import Distribution.Simple.Command
 
-import Distribution.Simple.Utils (rawSystemExit, cabalVersion)
+import Distribution.Simple.Utils
 
-import Distribution.License (License(..))
+import Distribution.License
 import Distribution.Version
-         ( Version(..) )
 import Distribution.Text
-         ( display )
 
 import System.Environment (getArgs, getProgName)
-import Data.List  (intercalate)
 import System.Exit
 
 defaultMain :: IO ()

Cabal/Distribution/ModuleName.hs

@@ -22,14 +22,13 @@ module Distribution.ModuleName (
   ) where
 
 import Distribution.Text
-         ( Text(..) )
+import Distribution.Compat.Binary
+import qualified Distribution.Compat.ReadP as Parse
 
-import Distribution.Compat.Binary (Binary)
 import qualified Data.Char as Char
          ( isAlphaNum, isUpper )
 import Data.Data (Data)
 import Data.Typeable (Typeable)
-import qualified Distribution.Compat.ReadP as Parse
 import qualified Text.PrettyPrint as Disp
 import Data.List
          ( intercalate, intersperse )

Cabal/Distribution/Package.hs

@@ -26,6 +26,9 @@ module Distribution.Package (
         getHSLibraryName,
         InstalledPackageId, -- backwards compat
 
+        -- * ABI hash
+        AbiHash(..),
+
         -- * Package source dependencies
         Dependency(..),
         thisPackageVersion,
@@ -42,13 +45,13 @@ import Distribution.Version
          ( Version(..), VersionRange, anyVersion, thisVersion
          , notThisVersion, simplifyVersionRange )
 
-import Distribution.Text (Text(..))
 import qualified Distribution.Compat.ReadP as Parse
-import Distribution.Compat.ReadP ((<++))
 import qualified Text.PrettyPrint as Disp
+import Distribution.Compat.ReadP
+import Distribution.Compat.Binary
+import Distribution.Text
 
 import Control.DeepSeq (NFData(..))
-import Distribution.Compat.Binary (Binary)
 import qualified Data.Char as Char
     ( isDigit, isAlphaNum, )
 import Data.Data ( Data )
@@ -202,3 +205,14 @@ class Package pkg => HasComponentId pkg where
 -- Installed packages have exact dependencies 'installedDepends'.
 class (HasComponentId pkg) => PackageInstalled pkg where
   installedDepends :: pkg -> [ComponentId]
+
+-- -----------------------------------------------------------------------------
+-- ABI hash
+
+newtype AbiHash = AbiHash String
+    deriving (Eq, Show, Read, Generic)
+instance Binary AbiHash
+
+instance Text AbiHash where
+    disp (AbiHash abi) = Disp.text abi
+    parse = fmap AbiHash (Parse.munch Char.isAlphaNum)

Cabal/Distribution/PackageDescription.hs

@@ -109,9 +109,20 @@ module Distribution.PackageDescription (
         SetupBuildInfo(..),
   ) where
 
-import Distribution.Compat.Binary (Binary)
+import Distribution.Compat.Binary
 import qualified Distribution.Compat.Semigroup as Semi ((<>))
 import Distribution.Compat.Semigroup as Semi (Monoid(..), Semigroup)
+import qualified Distribution.Compat.ReadP as Parse
+import Distribution.Compat.ReadP   ((<++))
+import Distribution.Package
+import Distribution.ModuleName
+import Distribution.Version
+import Distribution.License
+import Distribution.Compiler
+import Distribution.System
+import Distribution.Text
+import Language.Haskell.Extension
+
 import Data.Data                  (Data)
 import Data.Foldable              (traverse_)
 import Data.List                  (nub, intercalate)
@@ -123,27 +134,10 @@ import Control.Applicative as AP   (Alternative(..), Applicative(..))
 import Control.Monad               (MonadPlus(mplus,mzero), ap)
 import GHC.Generics                (Generic)
 import Text.PrettyPrint as Disp
-import qualified Distribution.Compat.ReadP as Parse
-import Distribution.Compat.ReadP   ((<++))
 import qualified Data.Char as Char (isAlphaNum, isDigit, toLower)
 import qualified Data.Map as Map
 import Data.Map                    (Map)
 
-import Distribution.Package
-         ( PackageName(PackageName), PackageIdentifier(PackageIdentifier)
-         , Dependency, Package(..), PackageName, packageName )
-import Distribution.ModuleName ( ModuleName )
-import Distribution.Version
-         ( Version(Version), VersionRange, anyVersion, orLaterVersion
-         , asVersionIntervals, LowerBound(..) )
-import Distribution.License  (License(UnspecifiedLicense))
-import Distribution.Compiler (CompilerFlavor)
-import Distribution.System   (OS, Arch)
-import Distribution.Text
-         ( Text(..), display )
-import Language.Haskell.Extension
-         ( Language, Extension )
-
 -- -----------------------------------------------------------------------------
 -- The PackageDescription type
 

Cabal/Distribution/PackageDescription/Check.hs

@@ -33,50 +33,30 @@ module Distribution.PackageDescription.Check (
         checkPackageFileNames,
   ) where
 
-import Data.Maybe
-         ( isNothing, isJust, catMaybes, mapMaybe, maybeToList, fromMaybe )
-import Data.List  (sort, group, isPrefixOf, nub, find)
-import Control.Monad
-         ( filterM, liftM )
-import qualified System.Directory as System
-         ( doesFileExist, doesDirectoryExist )
-import qualified Data.Map as Map
-
 import Distribution.PackageDescription
 import Distribution.PackageDescription.Configuration
-         ( flattenPackageDescription, finalizePackageDescription )
 import Distribution.Compiler
-         ( CompilerFlavor(..), buildCompilerFlavor, CompilerId(..)
-         , unknownCompilerInfo, AbiTag(..) )
 import Distribution.System
-         ( OS(..), Arch(..), buildPlatform )
 import Distribution.License
-         ( License(..), knownLicenses )
 import Distribution.Simple.CCompiler
-         ( filenameCDialect )
-import Distribution.Simple.Utils
-         ( cabalVersion, intercalate, parseFileGlob, FileGlob(..), lowercase, startsWithBOM, fromUTF8 )
-
+import Distribution.Simple.Utils hiding (findPackageDesc, notice)
 import Distribution.Version
-         ( Version(..)
-         , VersionRange(..), foldVersionRange'
-         , anyVersion, noVersion, thisVersion, laterVersion, earlierVersion
-         , orLaterVersion, orEarlierVersion
-         , unionVersionRanges, intersectVersionRanges
-         , asVersionIntervals, UpperBound(..), isNoVersion )
 import Distribution.Package
-         ( PackageName(PackageName), packageName, packageVersion
-         , Dependency(..), pkgName )
-
 import Distribution.Text
-         ( display, disp )
+import Language.Haskell.Extension
+
+import Data.Maybe
+         ( isNothing, isJust, catMaybes, mapMaybe, maybeToList, fromMaybe )
+import Data.List  (sort, group, isPrefixOf, nub, find)
+import Control.Monad
+         ( filterM, liftM )
+import qualified System.Directory as System
+         ( doesFileExist, doesDirectoryExist )
+import qualified Data.Map as Map
+
 import qualified Text.PrettyPrint as Disp
 import Text.PrettyPrint ((<>), (<+>))
 
-import qualified Language.Haskell.Extension as Extension (deprecatedExtensions)
-import Language.Haskell.Extension
-         ( Language(UnknownLanguage), knownLanguages
-         , Extension(..), KnownExtension(..) )
 import qualified System.Directory (getDirectoryContents)
 import System.IO (openBinaryFile, IOMode(ReadMode), hGetContents)
 import System.FilePath
@@ -442,14 +422,14 @@ checkFields pkg =
         ++ ". Languages must be specified in either the 'default-language' "
         ++ " or the 'other-languages' field."
 
-  , check (not (null deprecatedExtensions)) $
+  , check (not (null ourDeprecatedExtensions)) $
       PackageDistSuspicious $
            "Deprecated extensions: "
-        ++ commaSep (map (quote . display . fst) deprecatedExtensions)
+        ++ commaSep (map (quote . display . fst) ourDeprecatedExtensions)
         ++ ". " ++ unwords
              [ "Instead of '" ++ display ext
             ++ "' use '" ++ display replacement ++ "'."
-             | (ext, Just replacement) <- deprecatedExtensions ]
+             | (ext, Just replacement) <- ourDeprecatedExtensions ]
 
   , check (null (category pkg)) $
       PackageDistSuspicious "No 'category' field."
@@ -491,8 +471,8 @@ checkFields pkg =
     unknownExtensions = [ name | bi <- allBuildInfo pkg
                                , UnknownExtension name <- allExtensions bi
                                , name `notElem` map display knownLanguages ]
-    deprecatedExtensions = nub $ catMaybes
-      [ find ((==ext) . fst) Extension.deprecatedExtensions
+    ourDeprecatedExtensions = nub $ catMaybes
+      [ find ((==ext) . fst) deprecatedExtensions
       | bi <- allBuildInfo pkg
       , ext <- allExtensions bi ]
     languagesUsedAsExtensions =
@@ -1340,10 +1320,10 @@ checkConditionals pkg =
     unknownOSs    = [ os   | OS   (OtherOS os)           <- conditions ]
     unknownArches = [ arch | Arch (OtherArch arch)       <- conditions ]
     unknownImpls  = [ impl | Impl (OtherCompiler impl) _ <- conditions ]
-    conditions = maybe [] freeVars (condLibrary pkg)
-              ++ concatMap (freeVars . snd) (condExecutables pkg)
-    freeVars (CondNode _ _ ifs) = concatMap compfv ifs
-    compfv (c, ct, mct) = condfv c ++ freeVars ct ++ maybe [] freeVars mct
+    conditions = maybe [] fvs (condLibrary pkg)
+              ++ concatMap (fvs . snd) (condExecutables pkg)
+    fvs (CondNode _ _ ifs) = concatMap compfv ifs -- free variables
+    compfv (c, ct, mct) = condfv c ++ fvs ct ++ maybe [] fvs mct
     condfv c = case c of
       Var v      -> [v]
       Lit _      -> []
@@ -1537,7 +1517,8 @@ checkCabalFileBOM ops = do
                                     pdfile ++ " starts with an Unicode byte order mark (BOM). This may cause problems with older cabal versions."
 
 -- |Find a package description file in the given directory.  Looks for
--- @.cabal@ files.
+-- @.cabal@ files.  Like 'Distribution.Simple.Utils.findPackageDesc',
+-- but generalized over monads.
 findPackageDesc :: Monad m => CheckPackageContentOps m
                  -> m (Either PackageCheck FilePath) -- ^<pkgname>.cabal
 findPackageDesc ops

Cabal/Distribution/PackageDescription/Configuration.hs

@@ -29,33 +29,18 @@ module Distribution.PackageDescription.Configuration (
   ) where
 
 import Distribution.Package
-         ( PackageName, Dependency(..) )
 import Distribution.PackageDescription
-         ( GenericPackageDescription(..), PackageDescription(..)
-         , Library(..), Executable(..), BuildInfo(..)
-         , Flag(..), FlagName(..), FlagAssignment
-         , Benchmark(..), CondTree(..), ConfVar(..), Condition(..)
-         , TestSuite(..) )
 import Distribution.PackageDescription.Utils
-         ( cabalBug, userBug )
 import Distribution.Version
-         ( VersionRange, anyVersion, intersectVersionRanges, withinRange )
 import Distribution.Compiler
-         ( CompilerId(CompilerId) )
 import Distribution.System
-         ( Platform(..), OS, Arch )
 import Distribution.Simple.Utils
-         ( currentDir, lowercase )
-import Distribution.Simple.Compiler
-         ( CompilerInfo(..) )
-
 import Distribution.Text
-         ( Text(parse) )
 import Distribution.Compat.ReadP as ReadP hiding ( char )
-import Control.Arrow (first)
 import qualified Distribution.Compat.ReadP as ReadP ( char )
 import Distribution.Compat.Semigroup as Semi
 
+import Control.Arrow (first)
 import Data.Char ( isAlphaNum )
 import Data.Maybe ( mapMaybe, maybeToList )
 import Data.Map ( Map, fromListWith, toList )

Cabal/Distribution/PackageDescription/Parse.hs

@@ -41,6 +41,19 @@ module Distribution.PackageDescription.Parse (
         flagFieldDescrs
   ) where
 
+import Distribution.ParseUtils hiding (parseFields)
+import Distribution.PackageDescription
+import Distribution.PackageDescription.Utils
+import Distribution.Package
+import Distribution.ModuleName
+import Distribution.Version
+import Distribution.Verbosity
+import Distribution.Compiler
+import Distribution.PackageDescription.Configuration
+import Distribution.Simple.Utils
+import Distribution.Text
+import Distribution.Compat.ReadP hiding (get)
+
 import Data.Char     (isSpace)
 import Data.Foldable (traverse_)
 import Data.Maybe    (listToMaybe, isJust)
@@ -54,30 +67,8 @@ import Control.Arrow    (first)
 import System.Directory (doesFileExist)
 import qualified Data.ByteString.Lazy.Char8 as BS.Char8
 
-import Distribution.Text
-         ( Text(disp, parse), display, simpleParse )
-import Distribution.Compat.ReadP
-         ((+++), option)
 import Text.PrettyPrint
 
-import Distribution.ParseUtils hiding (parseFields)
-import Distribution.PackageDescription
-import Distribution.PackageDescription.Utils
-         ( cabalBug, userBug )
-import Distribution.Package
-         ( PackageIdentifier(..), Dependency(..), packageName, packageVersion )
-import Distribution.ModuleName ( ModuleName )
-import Distribution.Version
-        ( Version(Version), orLaterVersion
-        , LowerBound(..), asVersionIntervals )
-import Distribution.Verbosity (Verbosity)
-import Distribution.Compiler  (CompilerFlavor(..))
-import Distribution.PackageDescription.Configuration (parseCondition, freeVars)
-import Distribution.Simple.Utils
-         ( die, dieWithLocation, warn, intercalate, lowercase, cabalVersion
-         , withFileContents, withUTF8FileContents
-         , writeFileAtomic, writeUTF8File )
-
 
 -- -----------------------------------------------------------------------------
 -- The PackageDescription type
@@ -902,7 +893,6 @@ parsePackageDescription file = do
                         -- Does the current node specify a test type?
                         hasTestType = testInterface ts'
                             /= testInterface emptyTestSuite
-                        components = condTreeComponents ct
                     -- If the current level of the tree specifies a type,
                     -- then we are done. If not, then one of the conditional
                     -- branches below the current node must specify a type.
@@ -910,7 +900,7 @@ parsePackageDescription file = do
                     -- only one need one to specify a type because the
                     -- configure step uses 'mappend' to join together the
                     -- results of flag resolution.
-                    in hasTestType || any checkComponent components
+                    in hasTestType || any checkComponent (condTreeComponents ct)
             if checkTestType emptyTestSuite flds
                 then do
                     skipField
@@ -951,7 +941,6 @@ parsePackageDescription file = do
                         -- Does the current node specify a benchmark type?
                         hasBenchmarkType = benchmarkInterface ts'
                             /= benchmarkInterface emptyBenchmark
-                        components = condTreeComponents ct
                     -- If the current level of the tree specifies a type,
                     -- then we are done. If not, then one of the conditional
                     -- branches below the current node must specify a type.
@@ -959,7 +948,7 @@ parsePackageDescription file = do
                     -- only one need one to specify a type because the
                     -- configure step uses 'mappend' to join together the
                     -- results of flag resolution.
-                    in hasBenchmarkType || any checkComponent components
+                    in hasBenchmarkType || any checkComponent (condTreeComponents ct)
             if checkBenchmarkType emptyBenchmark flds
                 then do
                     skipField

Cabal/Distribution/PackageDescription/PrettyPrint.hs

@@ -17,25 +17,18 @@ module Distribution.PackageDescription.PrettyPrint (
     showGenericPackageDescription,
 ) where
 
-import Data.Monoid as Mon (Monoid(mempty))
 import Distribution.PackageDescription
-       ( Benchmark(..), BenchmarkInterface(..), benchmarkType
-       , TestSuite(..), TestSuiteInterface(..), testType
-       , SourceRepo(..),
-        customFieldsBI, CondTree(..), Condition(..), cNot,
-        FlagName(..), ConfVar(..), Executable(..), Library(..),
-        Flag(..), PackageDescription(..),
-        GenericPackageDescription(..))
+import Distribution.Simple.Utils
+import Distribution.ParseUtils
+import Distribution.PackageDescription.Parse
+import Distribution.Package
+import Distribution.Text
+
+import Data.Monoid as Mon (Monoid(mempty))
+import Data.Maybe (isJust)
 import Text.PrettyPrint
        (hsep, parens, char, nest, empty, isEmpty, ($$), (<+>),