[GHC] #9724: reexport IsList class from a trustworthy module

[GHC]

#9724: reexport IsList class from a trustworthy module
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              Reporter:  int-e       |            Owner:  ekmett
                  Type:  feature     |           Status:  new
  request                            |        Milestone:
              Priority:  normal      |          Version:  7.8.3
             Component:  Core        |         Keywords:
  Libraries                          |     Architecture:  Unknown/Multiple
            Resolution:              |       Difficulty:  Unknown
      Operating System:              |       Blocked By:
  Unknown/Multiple                   |  Related Tickets:
       Type of failure:              |
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Changes (by goldfire):

 * cc: eir@… (added)


Comment:

 I agree that this deserves some attention. I always feel dirty importing
 `GHC.Exts`, and the non-dirty things from there should have other places
 to be pulled from. I'm specifically thinking of `Constraint`, but I'm sure
 there are things other than just `IsList` and `Constraint` that should
 find new homes.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9724#comment:1>
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