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Edsko de Vries authored
Introduce a new superclass HasInstalledPackageId: class Package pkg => HasInstalledPackageId pkg where installedPackageId :: pkg -> InstalledPackageId class HasInstalledPackageId pkg => PackageInstalled pkg where installedDepends :: pkg -> [InstalledPackageId] Most functions that deal with the package index now just require HasInstalledPackageId; only the functions that actually require the dependencies still rely on PackageInstalled. The point is that a ConfiguredPackage/ReadyPackage/PlanPackage can reasonably be made an instance of HasInstalledPackageId, but not of PackageInstalled; that will be the topic of the next, much larger, pull request.
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