[GHC] #11383: CAFs lose sharing due to implicit call stacks

[GHC]

#11383: CAFs lose sharing due to implicit call stacks
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        Reporter:  simonmar          |                Owner:  gridaphobe
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  8.0.1-rc1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #11298            |  Differential Rev(s):  Phab:D1912
       Wiki Page:                    |
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Comment (by rwbarton):

 Replying to [comment:7 gridaphobe]:
 > On a related note, do we have a warning (or less severely, a note) for
 when we infer a polymorphic type that the monomorphism restriction would
 have prevented? That might be useful to pair with
 NoMonomorphismRestriction.

 I agree this would be nice; I've always wished the monomorphism
 restriction was instead a warning like this.

 There is `-fwarn-monomorphism-restriction`, but it does the reverse: when
 the monomorphism restriction is on, it warns about bindings that it
 applies to.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11383#comment:8>
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