[GHC] #13360: Add a flag to enable inferring HasCallStack constraints

[GHC]

#13360: Add a flag to enable inferring HasCallStack constraints
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        Reporter:  gridaphobe        |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  8.0.1
      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 saurabhnanda):

 > I did a couple ​microbenchmarks a while ago.

 Thanks for sharing the benchmarks. They seem to be reporting a 50-250%
 slowdown with HasCallstack. My hunch is that the slowdown is linear wrt
 the depth of the call-stack. Will need to do some benchmarking to be sure
 of this.

 Do you know what the underlying data-structure for storing the call-stack
 is? IIUC, callstacks have been implemented as an extra implicit argument,
 and the slowdown shouldn't be more than adding a regular argument (say, a
 global configuration record) to a regular function.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13360#comment:9>
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