Squashed commit of the following:

commit 6549c3e569d0e0c3714814860201924432da2435
Author: Trevor Elliott <trevor@galois.com>
Date:   Sun Sep 8 16:43:42 2013 -0700

    Document `data kind` syntax

commit 81c6d7b884e819cf0b0569cef23b67bb5aff8944
Merge: 6c3f34c c798a8c
Author: Trevor Elliott <trevor@galois.com>
Date:   Sun Sep 8 11:40:47 2013 -0700

    Merge remote-tracking branch 'head/master' into data-kind-syntax-v2

commit 6c3f34c80bd8b17920a956e194ec29d1affbd776
Author: Trevor Elliott <awesomelyawesome@gmail.com>
Date:   Wed Aug 28 02:21:07 2013 -0400

    Merge with the roles changes

      There a bunch of spots where the roles haven't been properly integrated with,
    so this patch should get some review.

commit 6bb530f50f655e74fb4e337311699eee46b519b7
Merge: 7d27880 4b5238a
Author: Trevor Elliott <awesomelyawesome@gmail.com>
Date:   Tue Aug 27 02:35:55 2013 -0400

    Merge remote-tracking branch 'head/master' into data-kind-syntax-v2

    Conflicts:
    	compiler/basicTypes/DataCon.lhs
    	compiler/iface/IfaceSyn.lhs
    	compiler/main/PprTyThing.hs
    	compiler/parser/Lexer.x
    	compiler/parser/Parser.y.pp
    	compiler/typecheck/TcInstDcls.lhs
    	compiler/typecheck/TcTyClsDecls.lhs
    	compiler/typecheck/TcTyDecls.lhs
    	compiler/types/TyCon.lhs

commit 7d2788021dab549ffd888deb9f28c8e7eab0d4ba
Author: Trevor Elliott <trevor@galois.com>
Date:   Mon Jul 29 09:05:38 2013 -0700

    Migrate through some lost instances

commit 13e1f41ec9252fd9d547d8e4b9fb04ffaf43c105
Merge: e051060 9e185cc
Author: Trevor Elliott <awesomelyawesome@gmail.com>
Date:   Sun Jul 28 14:28:05 2013 -0400

    Merge remote-tracking branch 'origin/master' into data-kind-syntax-v2

    Moved Binary instances for data-kind related types to IfaceSyn

commit e051060bbef4d359f2b1caa1c6135b23df17ffe7
Merge: 08d7c2f 2f99cdb
Author: Trevor Elliott <awesomelyawesome@gmail.com>
Date:   Wed Jul 17 01:58:16 2013 -0400

    Merge remote-tracking branch 'origin/master' into data-kind-syntax-v2

commit 08d7c2fca10a8c89b6fd638536a28972753ae360
Author: Trevor Elliott <awesomelyawesome@gmail.com>
Date:   Mon Jul 1 21:56:48 2013 -0400

    Fix some bugs from the merge with master

     * Figure out what the right choice for the kind checking strategy of kind decls
       should be

commit 12f055d23a1b5c0a74d2db0784b779b605f3888f
Merge: f0adbdc e56b9d5
Author: Trevor Elliott <awesomelyawesome@gmail.com>
Date:   Mon Jul 1 21:12:47 2013 -0400

    Merge remote-tracking branch 'origin/master' into data-kind-syntax-v2

    Conflicts:
    	compiler/typecheck/TcTyClsDecls.lhs

commit f0adbdc29fefc54675f0960e3178f3b079058eea
Author: Trevor Elliott <awesomelyawesome@gmail.com>
Date:   Sun Jun 23 15:53:06 2013 -0400

    Swap the names for PromotionFlavor and PromotionInfo

commit e177270dc002f45286a9b644935ea339d8a6c8d3
Merge: 16df4be 3660ef9
Author: Trevor Elliott <awesomelyawesome@gmail.com>
Date:   Sat Jun 22 04:00:15 2013 -0400

    Merge remote-tracking branch 'origin/master' into data-kind-syntax-v2

commit 16df4beac24065d3075a65b26add543452d1f2b2
Merge: b021b30 569b265
Author: Trevor Elliott <awesomelyawesome@gmail.com>
Date:   Sat Jun 22 02:41:14 2013 -0400

    merge with master

commit b021b30f66fdb66965f6c57fb0969317c9aeb9e3
Author: Trevor Elliott <trevor@galois.com>
Date:   Thu Jun 20 19:39:20 2013 -0700

    Start reworking comments

commit b765370181571c1922b508f8dd17648a090ac248
Merge: d1ac794 e4fc6fd
Author: Trevor Elliott <trevor@galois.com>
Date:   Thu Jun 20 18:27:43 2013 -0700

    Merge branch 'master' into data-kind-syntax-v2

commit d1ac794b5bd06ae04e014cabe4560628b70fcdeb
Merge: 9ad0a3c 73991d6
Author: Trevor Elliott <trevor@galois.com>
Date:   Thu Jun 20 18:16:15 2013 -0700

    Merge remote-tracking branch 'origin/master' into data-kind-syntax-v2

commit 9ad0a3c57a5b77f5040f1201b2c53a84680c1af2
Author: Trevor Elliott <trevor@galois.com>
Date:   Thu Jun 20 18:13:58 2013 -0700

    Don't add the promotion tick to data kind constructors

commit 8c37784e31702ecf7d91f2d7cf7dfab675a56927
Merge: 4dff379 db9b631
Author: Trevor Elliott <trevor@galois.com>
Date:   Mon Jun 17 10:55:51 2013 -0700

    Merge remote-tracking branch 'origin/master' into data-kind-syntax-v2

    Conflicts:
    	compiler/main/PprTyThing.hs
    	compiler/rename/RnTypes.lhs
    	compiler/types/TyCon.lhs

commit 4dff3791ac9d1175d26f8c3b44923aefbe6c3f40
Author: Trevor Elliott <trevor@galois.com>
Date:   Mon Jun 3 20:45:00 2013 -0700

    When parsing interfaces, use forkM while checking type constructors

commit 7903009475b3e89aecc0a8e5d328ea84ea53a39d
Author: Trevor Elliott <trevor@galois.com>
Date:   Mon Jun 3 20:06:40 2013 -0700

    When parsing data kind declarations, don't change the constructor namespace

commit 78ff545601cedba106eda05a38ce8f24f8480961
Author: Trevor Elliott <trevor@galois.com>
Date:   Mon May 27 18:45:52 2013 -0700

    Switch from Maybe TyCon to a richer type for promotion

      The new type distinguishes the two cases where promotion isn't possible:
    1) Promotion isn't possible, as it's disabled by a 'data type' declaration
    2) Promotion isn't possible because we don't know how to promote it

commit 0573fd3e8f9822171ddeb0df937e10075b653678
Author: Trevor Elliott <trevor@galois.com>
Date:   Mon May 27 17:36:21 2013 -0700

    Remove an old TODO

commit e218d5d6848109e9dea129250199115a9db6b1d9
Author: Trevor Elliott <trevor@galois.com>
Date:   Mon May 27 17:36:15 2013 -0700

    Properly print data kind declarations in ghci

commit 22b011d43f84cb0478eded613344e1dd165664e5
Author: Trevor Elliott <trevor@galois.com>
Date:   Thu May 16 18:38:22 2013 -0700

    Switch to using the PromotedDataCon for the RHS of a data kind

      Something is still wrong here: doing :browse will get a panic for some
    reason.

commit 12db8c704765d2775b0299c2e718d015577a6f18
Author: Trevor Elliott <trevor@galois.com>
Date:   Sat May 4 19:06:43 2013 -0700

    Thread data kind syntax through the interface

      Things are not quite right at the moment.  The issue is that we can't
    distinguish abstract types from types that are constructors in a data kind.
    As such, we should introduce a new constructor to TyCon to help
    disambiguate these two cases.  Also it might be nice to add a new TyCon
    for kinds, which would avoid the need for a new RHS in the AlgTyCon case.

commit 73f19612444e2a3b1534ab41f02449c9a5191ccb
Author: Trevor Elliott <trevor@galois.com>
Date:   Tue Apr 30 20:30:21 2013 -0700

    Handle kind declarations separately

commit 8d3bf040748026829382c5d13421f910b3f9fcf9
Author: Trevor Elliott <trevor@galois.com>
Date:   Fri Apr 26 20:40:49 2013 -0700

    Partial type-kind checking of `data kind` declarations

commit 2399eb788ed0fe571c22de4f810080a323ddaceb
Author: Trevor Elliott <trevor@galois.com>
Date:   Fri Apr 26 18:01:28 2013 -0700

    Support empty `data kind` declarations

commit 61a28f2df42b34742219a97a22c029f840fef7f5
Author: Trevor Elliott <trevor@galois.com>
Date:   Fri Apr 26 17:34:31 2013 -0700

    Rename `data kind` declarations

commit 5d3485a3e3ab7a78f1055b872f78203d5d005b76
Author: Trevor Elliott <trevor@galois.com>
Date:   Fri Apr 26 16:53:26 2013 -0700

    Fix a typo in a parser comment

commit 7f631cf41a3ca84cd820b292711014b4e806a440
Author: Trevor Elliott <trevor@galois.com>
Date:   Fri Apr 26 16:53:00 2013 -0700

    Add paring for `data kind` declarations

commit d29733901b2cd195989cdc972ac74c1ed4f19670
Author: Trevor Elliott <trevor@galois.com>
Date:   Fri Apr 26 14:31:30 2013 -0700

    Rename typeLiteralsBit to dataKindsBit in the lexer

commit ca8ae194826fc47a2ba4f0188d62f5247b0fe631
Author: Trevor Elliott <trevor@galois.com>
Date:   Fri Apr 26 14:27:50 2013 -0700

    Add a check for -XDataKinds when parsing a `data type` declaration

commit 8588717e8ce224affa584bd1e27aa14e098f5a8f
Author: Trevor Elliott <trevor@galois.com>
Date:   Fri Apr 26 14:18:41 2013 -0700

    Implement the 'data type' syntax and checking

      Add a new form of data declaration where the 'type' modifier can be used
    to prevent data promotion.  For example

      data type T = K

    will not yield a promoted kind T, and promoted type K, even though they are
    in principle promotable.