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it seems that this closure type has not been in use since 5d52d9, so all this is dead and untested code. This removes it. Some of the code might be useful for a counting indirection as described in #10613, so when implementing that, have a look at what this commit removes. Test Plan: validate on harbormaster Reviewers: austin, bgamari, simonmar Reviewed By: simonmar Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1821
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