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The implementation of `mask` and `uninterruptibleMask` assumed so far that the restore argument would be called in a context with the same masking state as that set by `mask` or `uninterruptibleMask`. This patch has the restore argument restore the masking, whatever the current masking state is. Test Plan: validate Reviewers: simonmar, hvr, austin, bgamari Reviewed By: bgamari Subscribers: thomie, qnikst Differential Revision: https://phabricator.haskell.org/D1327 GHC Trac Issues: #10149
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