[GHC] #7398: RULES don't apply to a newtype constructor

[GHC]

#7398: RULES don't apply to a newtype constructor
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        Reporter:  shachaf           |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.6.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:  #6082, #10418     |  Differential Revisions:
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Changes (by thomie):

 * failure:  Incorrect result at runtime => Runtime performance bug


Comment:

 Since RULES are usually (always?) defined for performance reasons, I'm
 grouping this with all other
 [https://ghc.haskell.org/trac/ghc/query?status=!closed&failure=Runtime+performance+bug
 runtime performance bugs].

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7398#comment:9>
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