[commit: ghc] master: Allow Windows to set blank environment variables (49e334c)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/49e334c8ea98cd5ecc81cfe10827538182815723/ghc

>---------------------------------------------------------------

commit 49e334c8ea98cd5ecc81cfe10827538182815723
Author: Habib Alamin <ha.alamin at gmail.com>
Date:   Mon Jul 31 05:48:43 2017 +0100

    Allow Windows to set blank environment variables
    
    Test Plan: ./validate on harbormaster
    
    Reviewers: austin, hvr, bgamari, erikd, Phyx
    
    Reviewed By: Phyx
    
    Subscribers: Phyx, rwbarton, thomie
    
    GHC Trac Issues: #12494
    
    Differential Revision: https://phabricator.haskell.org/D3726


>---------------------------------------------------------------

49e334c8ea98cd5ecc81cfe10827538182815723
 docs/users_guide/8.4.1-notes.rst            |   6 +
 libraries/base/System/Environment.hs        |  10 +-
 libraries/base/System/Environment/Blank.hsc | 196 ++++++++++++++++++++++++++++
 libraries/base/base.cabal                   |   1 +
 libraries/base/tests/T12494.hs              |  36 +++++
 libraries/base/tests/T12494.stdout          |   8 ++
 libraries/base/tests/all.T                  |   1 +
 7 files changed, 253 insertions(+), 5 deletions(-)

Diff suppressed because of size. To see it, use:

    git diff-tree --root --patch-with-stat --no-color --find-copies-harder --ignore-space-at-eol --cc 49e334c8ea98cd5ecc81cfe10827538182815723