• Ryan Scott's avatar
    Fix #14817 by not double-printing data family instance kind signatures · aef2b429
    Ryan Scott authored
    Within `pprDataFamInstDecl`, we were invoking `pprFamInstLHS` to
    pretty-print a data family instance header, and we were passing `Just` a
    kind signature to `pprFamInstLHS` to make it pretty-print the kind
    signature alongside it (this is a consequence of commit
    d1ef223c). But this is silly, because
    then invoke `pp_data_defn`, which //also// pretty-prints the kind
    signature, resulting in the kind signature being printed twice by
    This fix is simple—pass `Nothing` to `pprFamInstLHS` instead.
    Test Plan: make test TEST=T14817
    Reviewers: alanz, bgamari, mpickering
    Reviewed By: mpickering
    Subscribers: mpickering, rwbarton, thomie, carter
    GHC Trac Issues: #14817
    Differential Revision: https://phabricator.haskell.org/D4418
T14817.hs 144 Bytes