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niteria authored
This gives a 10% allocation improvement on MultiLayerModules. The idea is to reuse existing tuples, instead of constantly constructing new ones. Test Plan: ./validate Reviewers: simonpj, bgamari Reviewed By: simonpj, bgamari Subscribers: rwbarton, thomie, simonmar, carter Differential Revision: https://phabricator.haskell.org/D4332
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