[GHC] #13822: GHC not using injectivity?

[GHC]

#13822: GHC not using injectivity?
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        Reporter:  Iceland_jack      |                Owner:  (none)
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:  fixed             |             Keywords:
                                     |  InjectiveFamilies, TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
                                     |  typecheck/should_compile/T13822
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"04ca0360a6b38627c2608ed7468f4d8c46257e3a/ghc" 04ca036/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="04ca0360a6b38627c2608ed7468f4d8c46257e3a"
 testsuite: Add testcase for #13822

 Reviewers: austin

 Subscribers: rwbarton, thomie

 GHC Trac Issues: #13822

 Differential Revision: https://phabricator.haskell.org/D3655
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13822#comment:6>
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