[GHC] #12887: Make each RTS header self-contained

[GHC]

#12887: Make each RTS header self-contained
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           Reporter:  dobenour       |             Owner:
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Runtime        |           Version:  8.0.1
  System                             |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 We should make each header in the RTS self-contained – that is, make sure
 that it is valid when included on its own.  Otherwise, some tools (such as
 the YouCompleteMe semantic completion system for Vim) report spurious
 errors when editing header files.

 (Also, not sure if this belongs here, or as a task on Phabricator)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12887>
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