[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:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Core Libraries    |              Version:  7.8.3
      Resolution:                    |             Keywords:  SafeHaskell
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 kostmo):

 This issue also seems to block [https://github.com/Daniel-Diaz/sorted-
 list/pull/5 marking the `sorted-list` package as safe].  Does the `IsList`
 class (and its instances) depend on any unsafe functionality?  If not,
 could a new marked-`Safe` module named `GHC.Exts.List` be created so that
 people can safely import this subset?  `GHC.Exts.List` could then be re-
 exported from `GHC.Exts` for backwards-compatibility.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9724#comment:5>
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