Commit 443bf044 authored by Committed by Ben Gamari
Allow pattern synonyms which have several clauses.
But still disallow empty pattern synonym builder declarations. Handling this incorrectly was the cause of #11367. Test Plan: ./validate Reviewers: austin, bgamari Reviewed By: bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1779 GHC Trac Issues: #11367
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