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push() considers BLOCKING_QUEUES to be an invalid closure type which should never be present on the stack. However, retainClosure made no accomodation for this and ended up pushing such a closure. This lead to #14947. Test Plan: Validate Reviewers: simonmar, erikd Reviewed By: simonmar Subscribers: thomie, carter, RyanGlScott GHC Trac Issues: #14947 Differential Revision: https://phabricator.haskell.org/D4538
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