• Ryan Scott's avatar
    Make the tyvars in TH-reified data family instances uniform · b2c38d6b
    Ryan Scott authored
    It turns out we were using two different sets of type variables when
    reifying data family instances in Template Haskell. We were using the
    tyvars quantifying over the instance itself for the LHS, but using the
    tyvars quantifying over the data family instance constructor for the
    RHS. This commit uses the instance tyvars for both the LHS and the RHS,
    fixing #13618.
    Test Plan: make test TEST=T13618
    Reviewers: goldfire, austin, bgamari
    Reviewed By: goldfire, bgamari
    Subscribers: rwbarton, thomie
    GHC Trac Issues: #13618
    Differential Revision: https://phabricator.haskell.org/D3505
all.T 16.5 KB