[GHC] #11348: Local open type families instances ignored during type checking

[GHC]

#11348: Local open type families instances ignored during type checking
-------------------------------------+-------------------------------------
        Reporter:  alexvieth         |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1-rc1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by jstolarek):

 alexvieth, could you upload your patches to
 [https://phabricator.haskell.org Phab]? This is our preferred method of
 uploading and reviewing patches. See also this wiki page:
 [wiki:Phabricator].

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11348#comment:9>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler