Improve treatment of sectioned holes
Summary: Previously, GHC was pretty-printing left-section holes incorrectly and not parsing right-sectioned holes at all. This patch fixes both problems. Test Plan: make test TEST=T14590 Reviewers: bgamari, simonpj Reviewed By: simonpj Subscribers: simonpj, rwbarton, thomie, mpickering, carter GHC Trac Issues: #14590 Differential Revision: https://phabricator.haskell.org/D4273
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