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Previously we would form derived OccNames by first decoding the name being derived from, manipulating it in [Char] form, and then re-encoding. This is all very wasteful as we essentially always just want to concatenate. Instead we now take care to form the final name with only one concatFS. Test Plan: Validate, examing compiler allocations Reviewers: simonpj, austin Reviewed By: simonpj Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2387 GHC Trac Issues: #12357
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