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Matthew Pickering authored
The target of this patch is exports such as: ``` module Foo ( T(A, B, C) ) where ``` Essentially this patch makes sure that we use the correct lookup functions in order to lookup the names in parent-children export lists. This change highlighted the complexity of this small part of GHC which accounts for the scale. This change was motivated by wanting to remove the `PatternSynonym` constructor from `Parent`. As with all these things, it quickly spiraled out of control into a much larger refactor. Reviewers: simonpj, goldfire, bgamari, austin Subscribers: adamgundry, thomie Differential Revision: https://phabricator.haskell.org/D2179 GHC Trac Issues: #11970
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