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Using Template Haskell, one can construct lambda expressions with no arguments. The pretty-printer isn't aware of this fact, however. This changes that. Test Plan: make test TEST=T13856 Reviewers: bgamari, austin, goldfire Reviewed By: bgamari Subscribers: rwbarton, thomie GHC Trac Issues: #13856 Differential Revision: https://phabricator.haskell.org/D3664
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