[GHC] #15546: Display coaxiom branch incompatibilities in GHCi

[GHC]

#15546: Display coaxiom branch incompatibilities in GHCi
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        Reporter:  mniip             |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  GHCi              |              Version:  8.4.3
      Resolution:                    |             Keywords:  TypeFamilies,
                                     |  GHCi
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 simonpj):

 Isn't this incompatibility thing an implementation consideration?  If so,
 we should not burden the user with it.

 By all means have a flag to augment :i with that info.  We have a variety
 already: the blunderbus `-dppr-debug`, but also the more selective
 `-fprint-explicit-kinds` etc.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15546#comment:1>
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