[GHC] #13021: Inaccessible RHS warning is confusing for users

[GHC]

#13021: Inaccessible RHS warning is confusing for users
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        Reporter:  mpickering        |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
                                     |  PatternMatchWarnings
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 gkaracha):

 Even though I understand that the message can be confusing, I disagree
 with calling it in any way "redundant". Pattern matching is side-effectful
 in a lazy language and in fact we often use it just to force evaluation,
 so I would not consider it a minor thing. Before GHC 8, both redundant and
 with-inaccessible-rhs clauses where called "overlapping" which may be more
 appropriate.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13021#comment:1>
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