• Ryan Scott's avatar
    Missing Proxy instances, make U1 instance more Proxy-like · 171d95df
    Ryan Scott authored
    This accomplishes three things:
    * Adds missing `Alternative`, `MonadPlus`, and `MonadZip` instances for
    * Adds a missing `MonadPlus` instance for `U1`
    * Changes several existing `U1` instances to use lazy pattern-matching,
      exactly how `Proxy` does it (in case we ever replace `U1` with
      `Proxy`). This is technically a breaking change (albeit an extremely
      minor one).
    Test Plan: ./validate
    Reviewers: austin, ekmett, hvr, bgamari
    Reviewed By: bgamari
    Subscribers: thomie
    Differential Revision: https://phabricator.haskell.org/D1962
    GHC Trac Issues: #11650
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