[GHC] #10951: HPC program has poor error reporting / strange CLI in general

[GHC]

#10951: HPC program has poor error reporting / strange CLI in general
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        Reporter:  mgsloan           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  low               |            Milestone:
       Component:  Code Coverage     |              Version:  7.10.2
      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 mgsloan):

 1. Cool :D

 2. Good point.  Maybe the solution to #1 can just notice if there's more
 than one positional argument and explain to the user what their meaning
 is.

 3. Now I'm thinking it likely makes sense to take a conservative approach
 with these changes.  How about just letting `hpc combine` take more than
 two tix files?

 4. Yeah, I don't think this is needed anymore after thomie's changes

 5. Cool, sounds good!

 I hope to get around to these code changes soonish, but no promises - it
 might languish on the backburner for a little while.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10951#comment:6>
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