[GHC] #5889: -fno-prof-count-entries leads to linking errors

[GHC]

#5889: -fno-prof-count-entries leads to linking errors
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        Reporter:  akio              |                Owner:  bgamari
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  8.3
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:  x86_64
 Type of failure:  GHC rejects       |  (amd64)
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by duog):

 Replying to [comment:15 bgamari]:
 > Well, I think simonpj's question was really "why is the same
 simplification not also being performed when we inline the unfolding?"
 Indeed this is a good question and will need some investigation.

 One explanation could be that `newTyConEtadRhs` is inlined at the callsite
 of `newTyConInstRhs` because the constructor of `tycon_a9Sq` is known; and
 after that substitution the logic in comment:9 no longer applies.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5889#comment:16>
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