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When we have join j x y = rhs in ... we know that the lambdas for 'x' and 'y' are one-shot. Let's mark them as such! This doesn't fix a specific bug, but it feels right to me. Reviewers: austin, bgamari Reviewed By: bgamari Subscribers: lukemaurer, thomie Differential Revision: https://phabricator.haskell.org/D3196
777b7707