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Edward Z. Yang authored
Summary: These are going to be used by Backpack, but someone else might find them useful. They do the "obvious thing". Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu> Test Plan: validate Reviewers: goldfire, bgamari, austin Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1089
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