[GHC] #10803: New TypeSignatureSections extension

[GHC]

#10803: New TypeSignatureSections extension
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              Reporter:  hvr         |             Owner:
                  Type:  bug         |            Status:  new
              Priority:  normal      |         Milestone:  7.12.1
             Component:  Compiler    |           Version:  7.10.2
              Keywords:              |  Operating System:  Unknown/Multiple
          Architecture:              |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
             Test Case:              |        Blocked By:
              Blocking:              |   Related Tickets:
Differential Revisions:              |
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 = Preliminary specification

 Have

  - `(::` ''type'' `)`

 be syntax sugar for

  - `(\x -> x ::` ''type'' `)`

 This new syntax extension is enabled via a new `TypeSignatureSections`
 language pragma, i.e.

 {{{#!hs
 {#- LANGUAGE TypeSignatureSections #-}
 }}}

 TODO: formalise this a bit more

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10803>
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