[GHC] #8429: GHC.Base.{breakpoint, breakpointCond} do nothing

[GHC]

#8429: GHC.Base.{breakpoint, breakpointCond} do nothing
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       Reporter:  refold            |             Owner:
           Type:  bug               |            Status:  new
       Priority:  normal            |         Milestone:
      Component:  Compiler          |           Version:  7.6.3
       Keywords:                    |  Operating System:  Unknown/Multiple
   Architecture:  Unknown/Multiple  |   Type of failure:  None/Unknown
     Difficulty:  Unknown           |         Test Case:
     Blocked By:                    |          Blocking:
Related Tickets:  1377              |
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 The `GHC.Exts` module exports functions
 [[http://hackage.haskell.org/package/base-4.6.0.1/docs/GHC-
 Exts.html#g:6|breakpoint and breakpointCond]]. Right now they are no-ops,
 but apparently at some point in the past could be used to set breakpoints
 programmatically. From my reading of the source code, this feature was
 removed (either accidentally or on purpose) when the implementation of
 breakpoints [[changeset:cdce647711c0f46f5799b24de087622cb77e647f/ghc|was
 reworked]].

 Relevant commits:
     * 31751ccacc24ebe5d15a0af84b10dc612d455440
     * 3a99fa889bdff0c86df20cb18c71d30e30a79b43
     * cdce647711c0f46f5799b24de087622cb77e647f

 Initially reported [http://stackoverflow.com/questions/19283911/how-do-i
 -use-ghc-exts-breakpoint here].

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8429>
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