[GHC] #12494: Implementation of setenv in base incorrectly claims empty environment variable not supported on Windows

[GHC]

#12494: Implementation of setenv in base incorrectly claims empty environment
variable not supported on Windows
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        Reporter:  ezyang            |                Owner:  (none)
            Type:  bug               |               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 habibalamin):

 Here's how Ruby handles empty environment variables on Windows —
 https://github.com/ruby/ruby/commit/2982c5289210c02120172bf631270858681d031d
 #diff-1f049b4f9a6a39cee9cf18b2dc85f637R3147.

 Are we agreed on the course of action?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12494#comment:8>
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