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1. PreferAllInstalled :: PackagesPreferenceDefault

   cabal-install	Distribution.Client.Dependency.Types

   Always prefer the installed versions over ones that would need to be installed. Secondarily, prefer latest versions (eg the latest installed version or if there are none then the latest source version).

2. PreferAllLatest :: PackagesPreferenceDefault

   cabal-install	Distribution.Client.Dependency.Types

   Always prefer the latest version irrespective of any existing installed version.

   • This is the standard policy for upgrade.

3. PreferAllOldest :: PackagesPreferenceDefault

   cabal-install	Distribution.Client.Dependency.Types

   Always prefer the oldest version irrespective of any existing installed version or packages explicitly requested.

   • This is enabled by --prefer-oldest.

4. PreferLatestForSelected :: PackagesPreferenceDefault

   cabal-install	Distribution.Client.Dependency.Types

   Prefer the latest version for packages that are explicitly requested but prefers the installed version for any other packages.

   • This is the standard policy for install.

5. data ProjectRoot

   cabal-install	Distribution.Client.DistDirLayout

   Information about the root directory of the project. It can either be an implicit project root in the current dir if no cabal.project file is found, or an explicit root if either the file is found or the project root directory was specicied.

6. ProjectRootExplicit :: FilePath -> FilePath -> ProjectRoot

   cabal-install	Distribution.Client.DistDirLayout

   An explicit project root. It contains the absolute project root dir and the relative cabal.project file (or explicit override)

7. ProjectRootExplicitAbsolute :: FilePath -> FilePath -> ProjectRoot

   cabal-install	Distribution.Client.DistDirLayout

   An explicit, absolute project root dir and an explicit, absolute cabal.project file.

8. ProjectRootImplicit :: FilePath -> ProjectRoot

   cabal-install	Distribution.Client.DistDirLayout

   An implicit project root. It contains the absolute project root dir.

9. PackageDotCabalFileNotFound :: FilePath -> CabalInstallException

   cabal-install	Distribution.Client.Errors

   No documentation available.

10. PackageNameAmbiguousErr :: [(PackageName, [PackageName])] -> CabalInstallException

    cabal-install	Distribution.Client.Errors

    No documentation available.

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