[GHC] #7427: Proposal: Add setEnv/unsetEnv to System.Environment

[GHC]

#7427: Proposal: Add setEnv/unsetEnv to System.Environment
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        Reporter:  SimonHengel       |            Owner:
            Type:  feature request   |           Status:  closed
        Priority:  normal            |        Milestone:  7.8.1
       Component:  libraries/base    |          Version:  7.6.1
      Resolution:  fixed             |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by bgamari):

 I've updated the setenv package to re-export these symbols here,
 https://github.com/sol/setenv/pull/2

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7427#comment:7>
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