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Ryan Scott authored
While investigating #14947, I noticed that the `barf`ed error message in `push()` doesn't print out the closure type that causes it to crash. Let's do so. Reviewers: bgamari, erikd, simonmar Reviewed By: bgamari Subscribers: alexbiehl, rwbarton, thomie, carter Differential Revision: https://phabricator.haskell.org/D4525
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