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Add a flag to print type-synonyms-expanded versions of types in type
error messages (in addition to old error messages with synonyms)
* Mailing list discussion: https://mail.haskell.org/pipermail/ghc-devs/2015-June/009247.html
* Wiki page: https://wiki.haskell.org/Expanding_type_synonyms_in_error_messages_proposal
* Trac: https://ghc.haskell.org/trac/ghc/ticket/10547
Test Plan:
* I'll find some examples and add tests.
Reviewers: austin, simonpj, goldfire, bgamari
Reviewed By: austin, simonpj, goldfire, bgamari
Subscribers: rodlogic, thomie, bgamari
Differential Revision: https://phabricator.haskell.org/D1016
GHC Trac Issues: #10547
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