[GHC] #10547: feature request: expanding type synonyms in error messages

[GHC]

#10547: feature request: expanding type synonyms in error messages
-------------------------------------+-------------------------------------
        Reporter:  osa1              |                   Owner:  osa1
            Type:  feature request   |                  Status:  new
        Priority:  low               |               Milestone:  7.12.1
       Component:  Compiler (Type    |                 Version:
  checker)                           |                Keywords:
      Resolution:                    |            Architecture:
Operating System:  Unknown/Multiple  |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:  D1016
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"ae96c751c869813ab95e712f8daac8516bb4795f/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="ae96c751c869813ab95e712f8daac8516bb4795f"
 Implement -fprint-expanded-synonyms

 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
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10547#comment:8>
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