[commit: ghc] ghc-8.0: Fix #11723 and #11724. (54bacdd)

[git at git.haskell.org]

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

On branch  : ghc-8.0
Link       : http://ghc.haskell.org/trac/ghc/changeset/54bacddfc6d8df60d11b91b74e3e788d5c667bc4/ghc

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commit 54bacddfc6d8df60d11b91b74e3e788d5c667bc4
Author: Richard Eisenberg <eir at cis.upenn.edu>
Date:   Sat Mar 19 17:19:04 2016 -0400

    Fix #11723 and #11724.
    
    Test cases: typecheck/should_fail/T1172{3,4}
    
    (cherry picked from commit d978c5ed93482473b81bbe52bedf37d45d1e1029)


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54bacddfc6d8df60d11b91b74e3e788d5c667bc4
 compiler/typecheck/TcHsSyn.hs                      | 48 +++++++++++++++++-----
 compiler/typecheck/TcValidity.hs                   | 13 ++++++
 docs/users_guide/glasgow_exts.rst                  |  2 +-
 .../tests/dependent/should_fail/T11473.stderr      |  9 ++--
 testsuite/tests/typecheck/should_fail/T11723.hs    |  8 ++++
 .../tests/typecheck/should_fail/T11723.stderr      |  7 ++++
 testsuite/tests/typecheck/should_fail/T11724.hs    |  7 ++++
 .../tests/typecheck/should_fail/T11724.stderr      |  7 ++++
 testsuite/tests/typecheck/should_fail/all.T        |  2 +
 9 files changed, 86 insertions(+), 17 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 54bacddfc6d8df60d11b91b74e3e788d5c667bc4