[GHC] #13981: Family instance consistency checks happens too early when hs-boot defined type occurs on LHS

[GHC]

#13981: Family instance consistency checks happens too early when hs-boot defined
type occurs on LHS
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        Reporter:  ezyang            |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.4.1
       Component:  Compiler (Type    |              Version:  8.2.1-rc2
  checker)                           |
      Resolution:                    |             Keywords:  hs-boot
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by inaki):

 Replying to [comment:11 ezyang]:
 > I can't look into the problem right now, but if there is another
 minimization that demonstrates the problem, that would be very helpful.
 I just spent a good while trying to do this, but got badly misled by what
 I think is a different issue: #14075. I think that it is different because
 that one disappears when I use `-j1`, while the panic when compiling `gi-
 gio` remains. I will retry to re-minimize without using parallel make
 (hopefully side-stepping #14075 in this way) when I get a chance.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13981#comment:13>
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