[GHC] #11113: Type family If is too strict

[GHC]

#11113: Type family If is too strict
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        Reporter:  olshanskydr       |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
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 goldfire):

 At one point, I thought I could come up with a terrible hack that would
 fix this, but I don't think so anymore. What we really need is a proper
 (preferably lazy!) semantics for type-level reduction.

 I'm afraid I can't offer any workaround better than the one you've already
 come up with.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11113#comment:2>
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