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Using `IntSet` instead of `[Int]` is nicer since it gets rid of appending to a list (in the backward case) and folding over it is ordered. I also added a comment about how `mkDepBlocks` works since its behavior can be a bit surprising at first sight (it took me some time to see that it's doing the right thing ;) Signed-off-by: Michal Terepeta <michal.terepeta@gmail.com> Test Plan: ./validate Reviewers: austin, bgamari, simonmar Reviewed By: bgamari Subscribers: rwbarton, thomie Differential Revision: https://phabricator.haskell.org/D3530
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