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Add a --project function to ghc-pkg, that allows us to create a new package database that contains the closure of a given set of top packages.
ghc-pkg --project array --project vector --out-package-db ...
should create a new package-db, based on the global/env/... db, that takes array, and vector, and the closure leading up to it and creates a new package-db with only those packages.
The usecase is being able to create a package db specific to a subset of packages, easy to package up.
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