[GHC] #13698: Add a more complete example for the special SPEC argument to the user guide

[GHC]

#13698: Add a more complete example for the special SPEC argument to the user guide
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        Reporter:  mpickering        |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  SpecConstr        |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 Well the manual does say "After GHC inlines the body of `foldl` to a call
 site...".  But I agree that the entire description is unclear; hardly a
 specification of the SPEC business.

 Could you improve it?

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13698#comment:1>
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