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1. PackageStanzasPreference :: PackageName -> [OptionalStanza] -> PackagePreference

   cabal-install	Distribution.Client.Dependency

   If we would prefer to enable these optional stanzas (i.e. test suites and/or benchmarks)

2. PackageVersionPreference :: PackageName -> VersionRange -> PackagePreference

   cabal-install	Distribution.Client.Dependency

   A suggested constraint on the version number.

3. data PackagesPreferenceDefault

   cabal-install	Distribution.Client.Dependency

   Global policy for all packages to say if we prefer package versions that are already installed locally or if we just prefer the latest available.

4. PreferAllInstalled :: PackagesPreferenceDefault

   cabal-install	Distribution.Client.Dependency

   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).

5. PreferAllLatest :: PackagesPreferenceDefault

   cabal-install	Distribution.Client.Dependency

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

   • This is the standard policy for upgrade.

6. PreferAllOldest :: PackagesPreferenceDefault

   cabal-install	Distribution.Client.Dependency

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

   • This is enabled by --prefer-oldest.

7. PreferLatestForSelected :: PackagesPreferenceDefault

   cabal-install	Distribution.Client.Dependency

   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.

8. data Progress step fail done

   cabal-install	Distribution.Client.Dependency

   A type to represent the unfolding of an expensive long running calculation that may fail. We may get intermediate steps before the final result which may be used to indicate progress and/or logging messages.

9. data PackagesPreferenceDefault

   cabal-install	Distribution.Client.Dependency.Types

   Global policy for all packages to say if we prefer package versions that are already installed locally or if we just prefer the latest available.

10. data PreSolver

    cabal-install	Distribution.Client.Dependency.Types

    All the solvers that can be selected.

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