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Edward Z. Yang authored
Summary: This is in preparation for thinning/renaming package arguments, which allow users to rename modules of packages they import. In situations like this, it may be desirable to load multiple copies of a package at different versions explicitly under different names. Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu> Test Plan: validate Reviewers: simonpj, simonmar, hvr, austin Subscribers: simonmar, relrod, ezyang, carter Differential Revision: https://phabricator.haskell.org/D106
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