[GHC] #12013: CallStack is available from base 4.8, not 4.9

[GHC]

#12013: CallStack is available from base 4.8, not 4.9
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        Reporter:  edsko             |                Owner:
            Type:  bug               |               Status:  new
        Priority:  low               |            Milestone:
       Component:  Documentation     |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 Does it? It looks like it claims it's been available since `base-4.8.1.0`
 [http://git.haskell.org/ghc.git/blob/ad4392c142696d5092533480a82ed65322e9d413:/libraries/base/GHC/Stack/Types.hs#l132
 here].

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12013#comment:1>
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