[GHC] #14844: SpecConstr also non-recursive function

[GHC]

#14844: SpecConstr also non-recursive function
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        Reporter:  nomeata           |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.5
      Resolution:                    |             Keywords:  SpecConstr
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by nomeata):

 I have been staring at the !SpecConstr code quite a bit now (which is
 pretty dense, I must say), and am no longer able to say with certainty
 that !SpecConstr only works on recursive functions. In fact, it seems that
 `Note [Local let bindings]` implies local non-recursive lets are being
 specialized! (despite `Note [Good arguments]` claiming it only works for
 self-recursive functions…

 It seems that specialization for non-recursive functions was added in
 changeset:99f41975ae61fc919638aa389199b32742332eff by Simon PJ (maybe not
 all notes were updated to reflect this change)?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14844#comment:4>
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