[commit: ghc] master: Switch off lazy flattening (fix Trac #3064) (096b7e6)

[git at git.haskell.org]

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

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/096b7e664351d102cc9e15f3aa226a976af5dae2/ghc

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

commit 096b7e664351d102cc9e15f3aa226a976af5dae2
Author: Simon Peyton Jones <simonpj at microsoft.com>
Date:   Thu Nov 6 13:46:47 2014 +0000

    Switch off lazy flattening (fix Trac #3064)
    
    See Note [Lazy flattening] in TcFlatten.
    
    Lazy flattening was an apparently good idea which actually made
    the type inference engine go a LOTS slower in T3064.  So I switched
    it off again.


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096b7e664351d102cc9e15f3aa226a976af5dae2
 compiler/typecheck/TcBinds.lhs                     |  5 ++-
 compiler/typecheck/TcCanonical.lhs                 |  4 +-
 compiler/typecheck/TcFlatten.lhs                   | 43 ++++++++++++++++++----
 .../tests/indexed-types/should_fail/T2664.stderr   | 18 +++++----
 .../tests/indexed-types/should_fail/T7010.stderr   |  2 +-
 .../tests/indexed-types/should_fail/T8518.stderr   | 15 ++++++++
 testsuite/tests/perf/compiler/all.T                |  8 ++--
 7 files changed, 72 insertions(+), 23 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 096b7e664351d102cc9e15f3aa226a976af5dae2