[GHC] #15756: The "-fcontext-stack=N" GHC flag is not documented

[GHC]

#15756: The "-fcontext-stack=N" GHC flag is not documented
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           Reporter:  terrorjack     |             Owner:  (none)
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.6.1
           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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 Currently, there isn't an entry for the `-fcontext-stack=N` flag in the
 [Flag
 reference](https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/flags.html)
 section of GHC documentation.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15756>
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