[GHC] #14043: GHC.Stack.callStack throws exception

[GHC]

#14043: GHC.Stack.callStack throws exception
-------------------------------------+-------------------------------------
           Reporter:  bgamari        |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  high           |         Milestone:  8.4.1
          Component:  Compiler       |           Version:  8.0.1
           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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 This program,
 {{{#!hs
 import GHC.Stack
 main :: IO ()
 main =  putStrLn (prettyCallStack $ id (\_ -> callStack) ())
 }}}
 terminates with,
 {{{
 Hi: popCallStack: empty stack
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14043>
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