[GHC] #12805: Generalise type of asProxyTypeOf

[GHC]

#12805: Generalise type of asProxyTypeOf
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        Reporter:  tomjaguarpaw      |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  libraries/base    |              Version:  8.0.1
      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 RyanGlScott):

 I've personally no objection to this idea. But I urge you to run this by
 the [https://mail.haskell.org/mailman/listinfo/libraries Haskell libraries
 mailing list] first, since proposals to generalize type signatures in
 `base` have sometimes proven to be controversial :)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12805#comment:1>
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