Ben Gamari authored
unpackClosure#'s behavior and type has changed. This caused a CPP guard in the new ghc-heap package to fail when bootstrapping with GHC 8.4. Test Plan: Validate bootstrapping with GHC 8.4 Reviewers: RyanGlScott Subscribers: rwbarton, thomie, carter Differential Revision: https://phabricator.haskell.org/D4716e1fd9461
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