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This fixes #13615. See the rather lengthy Note [AP_STACKs must be eagerly blackholed] for details. Reviewers: simonmar, austin, erikd, dfeuer Subscribers: duog, dfeuer, hsyl20, rwbarton, thomie GHC Trac Issues: #13615 Differential Revision: https://phabricator.haskell.org/D3695
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