[GHC] #12812: Debugging functions should throw warnings

6 Nov 2016

      #12812: Debugging functions should throw warnings
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           Reporter:  siddhanathan   |             Owner:
               Type:  task           |            Status:  new
           Priority:  lowest         |         Milestone:
          Component:                 |           Version:  8.0.1
  libraries/base                     |
           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 function Debug.Trace.trace is useful for debugging, however, we don't
 want this function to be present in production code. An excerpt from
 Debug.Trace explains why:

 {{{
 The 'trace' function should /only/ be used for debugging, or for
 monitoring
 execution. The function is not referentially transparent: its type
 indicates
 that it is a pure function but it has the side effect of outputting the
 trace message.
 }}}

 It would be useful if the compiler threw warnings when such functions are
 used.

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Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12812
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