[GHC] #13066: Backpack doesn't check for fixity consistency

[GHC]

#13066: Backpack doesn't check for fixity consistency
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        Reporter:  ezyang            |                Owner:  ezyang
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler (Type    |              Version:  8.1
  checker)                           |
      Resolution:                    |             Keywords:  backpack
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2919
       Wiki Page:                    |
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Comment (by Edward Z. Yang <ezyang@…>):

 In [changeset:"e41c61fa7792d12ac7ffbacda7a5b3ba6ef2a267/ghc" e41c61f/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="e41c61fa7792d12ac7ffbacda7a5b3ba6ef2a267"
 Improve Backpack support for fixities.

 Summary:
 Two major bug-fixes:

     - Check that fixities match between hsig and implementation

     - Merge and preserve fixities when merging signatures

 Signed-off-by: Edward Z. Yang <ezyang at cs.stanford.edu>

 Test Plan: validate

 Reviewers: bgamari, simonpj, austin

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D2919

 GHC Trac Issues: #13066
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13066#comment:2>
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