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Ryan Scott authored
Summary: Commit 3540d1e1 inadvertently broke the ability for newtype instances to be used as marshallable types in FFI declarations. The reason is a bit silly: an extra check was added for type synonyms with no type families on the RHS in `normalise_tc_app`, but this check would only skip over type families, not //data// families, since the predicate being used was `not . isTypeFamilyCon`. The fix is simple: just use `not . isFamilyCon` instead so that data families are also skipped by this check. Test Plan: make test TEST=T14125 Reviewers: goldfire, simonpj, austin, bgamari Reviewed By: simonpj Subscribers: rwbarton, thomie GHC Trac Issues: #14125 Differential Revision: https://phabricator.haskell.org/D3865
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