[commit: ghc] wip/gadtpm: Several important fixes (We get a stack overflow though) (cc7e390)

[git at git.haskell.org]

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

On branch  : wip/gadtpm
Link       : http://ghc.haskell.org/trac/ghc/changeset/cc7e3902c536e68ad9aebaff75ca650dbeb35b7b/ghc

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

commit cc7e3902c536e68ad9aebaff75ca650dbeb35b7b
Author: George Karachalias <george.karachalias at gmail.com>
Date:   Thu Feb 5 08:59:24 2015 +0100

    Several important fixes (We get a stack overflow though)
    
      Fixed `tcTyVarDetails' failure (impossible happened):
        1. Extended `toTcType' to transform kinds as well
        2. Added `instTypePmM' and `instTypesPmM' for correct fresh tvs
    
      Improved performance:
        3. Made PmM a type synonym of DsM
        4. Removed redundant term substitutions
        5. Stopped calling isSatisfiable on covered vectors, as soon as the first
           well-typed is found
    
      Misc.
        6. Made toTcType pure (no actual need to be monadic)
    
      Important note:
        I have temporarily deactivated the propagation of EvVars in scope while
        traversing the AST, until the space leak problem is resolved.


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cc7e3902c536e68ad9aebaff75ca650dbeb35b7b
 compiler/deSugar/Check.hs       | 265 ++++++++++++++++------------------------
 compiler/deSugar/Match.hs       |   7 +-
 compiler/typecheck/TcMType.hs   |  17 +--
 compiler/typecheck/TcRnTypes.hs |  11 +-
 compiler/typecheck/TcSMonad.hs  |   4 +
 5 files changed, 133 insertions(+), 171 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 cc7e3902c536e68ad9aebaff75ca650dbeb35b7b