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Alan Zimmerman authored
Summary: When parsing {-# LANGUAGE ScopedTypeVariables #-} extremumNewton :: forall tag. forall tag1. tag -> tag1 -> Int extremumNewton = undefined the parser creates nested HsForAllTy's for the two forall statements. These get flattened into a single one in `HsTypes.mk_forall_ty` This patch removes the flattening, so that API Annotations are not lost in the process. Test Plan: ./validate Reviewers: goldfire, austin, simonpj Reviewed By: simonpj Subscribers: bgamari, mpickering, thomie, goldfire Differential Revision: https://phabricator.haskell.org/D836 GHC Trac Issues: #10278, #10315, #10354, #10363
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