[commit: ghc] ghc-8.2: Parenthesize pretty-printed equalities when necessary (66d5e80)

[git at git.haskell.org]

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

On branch  : ghc-8.2
Link       : http://ghc.haskell.org/trac/ghc/changeset/66d5e8015bed91fd0e2091641fe855c433c24b6c/ghc

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

commit 66d5e8015bed91fd0e2091641fe855c433c24b6c
Author: Ryan Scott <ryan.gl.scott at gmail.com>
Date:   Thu May 11 15:42:55 2017 -0400

    Parenthesize pretty-printed equalities when necessary
    
    Fixes #13677 by parenthesizing equalities in a sufficiently high
    pretty-printing context.
    
    Test Plan: make test TEST=T13677
    
    Reviewers: goldfire, austin, bgamari
    
    Reviewed By: bgamari
    
    Subscribers: rwbarton, thomie
    
    GHC Trac Issues: #13677
    
    Differential Revision: https://phabricator.haskell.org/D3570
    
    (cherry picked from commit 2277172ac3ea0bbeddebc9999a5d8b5f9f58afc9)


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66d5e8015bed91fd0e2091641fe855c433c24b6c
 compiler/iface/IfaceType.hs                        |  2 +-
 mk/build.mk.sample                                 |  4 +-
 rts/Libdw.c                                        | 83 ++++++++++++++++++----
 testsuite/tests/typecheck/should_fail/T13677.hs    | 11 +++
 .../tests/typecheck/should_fail/T13677.stderr      |  4 ++
 testsuite/tests/typecheck/should_fail/all.T        |  1 +
 6 files changed, 89 insertions(+), 16 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 66d5e8015bed91fd0e2091641fe855c433c24b6c