[GHC] #13227: Loss of full laziness in mapFB

[GHC]

#13227: Loss of full laziness in mapFB
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        Reporter:  simonpj           |                Owner:  nomeata
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3067
       Wiki Page:                    |
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Comment (by rwbarton):

 I can't quite tell from the discussion whether you are already aware of
 this, but just in case: The gains in Haddock performance from "Comments
 and tiny refactor only"
 (https://perf.haskell.org/ghc/#revision/fc9d152b058f21ab03986ea722d0c94688b9969f)
 seem to be undoing the losses of "Improve the Occurrence Analyzer’s
 handling of one-shot functions"
 (https://perf.haskell.org/ghc/#revision/a1980ecb5626ec85fc14fbd217e2d16c7d50a120).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13227#comment:22>
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