[GHC] #11656: Alllow static pointers to local closed definitions

[GHC]

#11656: Alllow static pointers to local closed definitions
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           Reporter:  mboes          |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  7.10.3
           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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 A limitation of the original patch implementing `-XStaticPointers` is that
 while the following all work,

 {{{#!hs
 t1 = static not
 t2 = static (\x -> case x of True -> False; False -> True)
 }}}

 the below does not:

 {{{#!hs
 t3 = static foo where foo True = False
 }}}

 Yet `foo` is perfectly "static": it's a closed expression that can readily
 be floated to top-level.

 So in short: `-XStaticPointers` should not consider only expressions with
 top-level identifiers, but in general any closed expression (which may
 involve local closed identifiers too).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11656>
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