[GHC] #11962: Support induction recursion

[GHC]

#11962: Support induction recursion
-------------------------------------+-------------------------------------
        Reporter:  goldfire          |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #13901            |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by RyanGlScott):

 * related:   => #13901


Comment:

 Replying to [ticket:11962 goldfire]:
 > (I'm cheating a bit here, because for unrelated reasons, we can't return
 a `forall` on the right-hand side of a type family. But that's not the
 issue at hand.)

 I'm tracking this issue separately at #13901, since I would find that
 useful in its own right.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11962#comment:6>
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