Commit 443bf044 authored by Committed by Ben GamariBrowse files
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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