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Ryan Scott authored
While investigating #15529, I noticed that the `barf`ed error message in `pop()` doesn't print out the closure type that causes it to crash. Let's do so. Reviewers: bgamari, erikd, simonmar Reviewed By: bgamari Subscribers: rwbarton, carter GHC Trac Issues: #15529 Differential Revision: https://phabricator.haskell.org/D5072
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