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Ryan Scott authored
Summary: There were previously some situations where `(->)` would not be desugared or reified as `ArrowT`, leading to various oddities such as those observed in #14888. We now uniformly treat `(->)` as `ArrowT` in Template Haskell–world by checking for any tycon that has the same name as `(->)`, and converting that to `ArrowT`. Test Plan: make test TEST=T14888 Reviewers: goldfire, bgamari, simonpj Reviewed By: goldfire, simonpj Subscribers: simonpj, rwbarton, thomie, carter GHC Trac Issues: #14888 Differential Revision: https://phabricator.haskell.org/D4466
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