[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
           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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 The documentation for `CallStack` claims it's available since 4.9 (ghc
 8.0), but actually it's available since 4.8 (ghc 7.10).

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