[commit: ghc] master: Fix unparseable pretty-printing of promoted data cons (767536c)

[git at git.haskell.org]

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

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/767536ccf95d8352d146b6544857b28d9c42937e/ghc

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

commit 767536ccf95d8352d146b6544857b28d9c42937e
Author: Andreas Herrmann <andreash87 at gmx.ch>
Date:   Thu Jun 7 13:24:52 2018 -0400

    Fix unparseable pretty-printing of promoted data cons
    
    Previously we would print code which would not round-trip:
    ```
    > :set -XDataKinds
    > :set -XPolyKinds
    > data Proxy k = Proxy
    > _ :: Proxy '[ 'True ]
    error:
      Found hole: _ :: Proxy '['True]
    > _ :: Proxy '['True]
    error:
        Invalid type signature: _ :: ...
        Should be of form <variable> :: <type>
    ```
    
    Test Plan: Validate with T14343
    
    Reviewers: RyanGlScott, goldfire, bgamari, tdammers
    
    Reviewed By: RyanGlScott, bgamari
    
    Subscribers: tdammers, rwbarton, thomie, carter
    
    GHC Trac Issues: #14343
    
    Differential Revision: https://phabricator.haskell.org/D4746


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

767536ccf95d8352d146b6544857b28d9c42937e
 compiler/iface/IfaceType.hs                        | 18 ++++++++--
 testsuite/tests/perf/compiler/T13035.stderr        |  2 +-
 testsuite/tests/perf/compiler/T9872b.stderr        | 32 +++++++++---------
 testsuite/tests/printer/Makefile                   |  8 +++++
 testsuite/tests/printer/T14343.hs                  | 12 +++++++
 testsuite/tests/printer/T14343.stderr              | 36 ++++++++++++++++++++
 testsuite/tests/printer/T14343b.hs                 | 12 +++++++
 testsuite/tests/printer/T14343b.stderr             | 39 ++++++++++++++++++++++
 testsuite/tests/printer/all.T                      |  2 ++
 .../tests/typecheck/should_fail/T15067.stderr      | 10 +++---
 testsuite/tests/unboxedsums/T12711.stdout          |  2 +-
 11 files changed, 147 insertions(+), 26 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 767536ccf95d8352d146b6544857b28d9c42937e