[GHC] #11526: unsafeLookupStaticPtr should not live in IO

[GHC]

#11526: unsafeLookupStaticPtr should not live in IO
-------------------------------------+-------------------------------------
           Reporter:  edsko          |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.1-rc1
           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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 `GHC.StaticPtr` provides

 {{{#!hs
 unsafeLookupStaticPtr :: StaticKey -> IO (Maybe (StaticPtr a))
 }}}

 I don't think this function should live in IO. It is morally pure (the SPT
 that it needs to access is static for the duration of the program after
 all) and when this lives in IO this function cannot be used in `Binary`
 instances (without using `unsafePerformIO`, obviously).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11526>
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