[GHC] #15526: Explain or remove mystery import in Unsafe.Coerce

[GHC]

#15526: Explain or remove mystery import in Unsafe.Coerce
-------------------------------------+-------------------------------------
           Reporter:  dfeuer         |             Owner:  (none)
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:  8.8.1
          Component:  Core           |           Version:  8.4.3
  Libraries                          |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Other
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 `Unsafe.Coerce` has the line

 {{{#!hs
 import GHC.Integer () -- for build ordering
 }}}

 It is not at all clear to me why build ordering demands that `GHC.Integer`
 be compiled before `Unsafe.Coerce` when the latter uses no numeric
 literals, no arithmetic, and no numeric types. If there's a real reason
 for this, the comment should be expanded. Otherwise, the import should be
 removed.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15526>
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