Commit 8936ab69 authored by Committed by Ben Gamari
Raise parse error for `data T where`.
Empty GADTs data declarations can't be identified in type checker. This patch adds additional checks in parser and raise a parse error when encounter empty GADTs declarations but extension `GADTs` is not enabled. Only empty declarations are checked in parser to avoid affecting existing error messages related to missing GADTs extension. This patch should fix issue 8258. Signed-off-by: HE, Tao <firstname.lastname@example.org> Test Plan: make test TEST="T8258 T8258NoGADTs" Reviewers: bgamari, mpickering, alanz, RyanGlScott Reviewed By: bgamari, RyanGlScott Subscribers: adamse, RyanGlScott, rwbarton, thomie, mpickering, carter GHC Trac Issues: #8258 Differential Revision: https://phabricator.haskell.org/D4350
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