-
Summary: Change the error message generated when a deriving clause related to a newtype fails to always suggested trying GeneralizedNewtypeDeriving, even in situations where it may not work. Fixes #9600. Test Plan: testsuite/deriving/should_fail/9600.hs Reviewers: austin, bgamari, simonpj Rebased-by: bgamari Reviewed By: simonpj Subscribers: bgamari, hvr, simonmar, carter Differential Revision: https://phabricator.haskell.org/D216 GHC Trac Issues: #9600
4f80ec0e