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Ryan Scott authored
When I defined `etaExpandFamInstLHS`, I blatantly forgot to eta expand the RHSes of data family instances. (Actually, I claimed that they didn't //need// to be eta expanded. I'm not sure what I was thinking.) This fixes the issue by changing `etaExpandFamInstLHS` to `etaExpandFamInst` and, well, making it actually eta expand the RHS. Test Plan: make test TEST=T15852 Reviewers: goldfire, bgamari Reviewed By: goldfire Subscribers: rwbarton, carter GHC Trac Issues: #15852 Differential Revision: https://phabricator.haskell.org/D5328
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