[commit: ghc] wip/ghc-8.0-det: Make Arrow desugaring deterministic (aff7cee)

[git at git.haskell.org]

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

On branch  : wip/ghc-8.0-det
Link       : http://ghc.haskell.org/trac/ghc/changeset/aff7cee7637f5f3f0fcfbd4817c96dd96001fecb/ghc

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commit aff7cee7637f5f3f0fcfbd4817c96dd96001fecb
Author: Bartosz Nitka <niteria at gmail.com>
Date:   Tue May 24 04:44:37 2016 -0700

    Make Arrow desugaring deterministic
    
    This kills two instances of varSetElems that turned out to be
    nondeterministic. I've tried to untangle this before, but it's
    a bit hard with the fixDs in the middle. Fortunately I now have
    a test case that proves that we need determinism here.
    
    Test Plan: ./validate, new testcase
    
    Reviewers: simonpj, simonmar, austin, bgamari
    
    Reviewed By: bgamari
    
    Subscribers: thomie
    
    Differential Revision: https://phabricator.haskell.org/D2258
    
    GHC Trac Issues: #4012


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aff7cee7637f5f3f0fcfbd4817c96dd96001fecb
 compiler/coreSyn/CoreFVs.hs                        | 33 ++++++++++++
 compiler/deSugar/DsArrows.hs                       | 63 +++++++++++-----------
 compiler/utils/UniqDFM.hs                          |  7 ++-
 testsuite/tests/determinism/determ018/A.hs         | 32 +++++++++++
 .../determinism/{determ013 => determ018}/Makefile  |  2 +-
 .../determinism/{determ009 => determ018}/all.T     |  4 +-
 .../determ018.stdout}                              |  0
 7 files changed, 106 insertions(+), 35 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 aff7cee7637f5f3f0fcfbd4817c96dd96001fecb