[GHC] #8347: Add a Strict LANGUAGE pragma

[GHC]

#8347: Add a Strict LANGUAGE pragma
-------------------------------------+-------------------------------------
        Reporter:  tibbe             |                   Owner:  tibbe
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.6.3
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:  Phab:D1033
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"f842ad6c751c14ec331ca1709538c2f3e9a30ae7/ghc" f842ad6/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="f842ad6c751c14ec331ca1709538c2f3e9a30ae7"
 Implementation of StrictData language extension

 This implements the `StrictData` language extension, which lets the
 programmer default to strict data fields in datatype declarations on a
 per-module basis.

 Specification and motivation can be found at
 https://ghc.haskell.org/trac/ghc/wiki/StrictPragma

 This includes a tricky parser change due to conflicts regarding `~` in
 the type level syntax: all ~'s are parsed as strictness annotations (see
 `strict_mark` in Parser.y) and then turned into equality constraints at
 the appropriate places using `RdrHsSyn.splitTilde`.

 Updates haddock submodule.

 Test Plan: Validate through Harbormaster.

 Reviewers: goldfire, austin, hvr, simonpj, tibbe, bgamari

 Reviewed By: simonpj, tibbe, bgamari

 Subscribers: lelf, simonpj, alanz, goldfire, thomie, bgamari, mpickering

 Differential Revision: https://phabricator.haskell.org/D1033

 GHC Trac Issues: #8347
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8347#comment:5>
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