[GHC] #15498: HPC: do notation marks () as non-covered

[GHC]

#15498: HPC: do notation marks () as non-covered
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        Reporter:  tom-bop           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Code Coverage     |              Version:  8.2.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  error/warning at compile-time      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by osa1):

 Do you mean `()` should've marked as evaluated because it's a CAF?
 Otherwise I think the coverage output is correct, `()` is never evaluated.
 Replace `()` with `undefined` and you'll see that program output does not
 change.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15498#comment:1>
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