[GHC] #13689: Data.Either doesn't export INLINABLE short functions like "rights"

[GHC]

#13689: Data.Either doesn't export INLINABLE short functions like "rights"
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        Reporter:  varosi            |                Owner:  (none)
            Type:  bug               |               Status:  infoneeded
        Priority:  normal            |            Milestone:
       Component:  Core Libraries    |              Version:  8.0.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect API     |  Unknown/Multiple
  annotation                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by rwbarton):

 * status:  new => infoneeded


Comment:

 No, that isn't how inlining works. You do not need an INLINABLE pragma on
 a function for its unfolding to be included in an interface file and used
 at a call site. (Otherwise virtually nothing would get inlined ever!)

 Can you provide a reproducer where you are not seeing inlining that you
 expect to happen?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13689#comment:1>
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