[GHC] #12990: Partially applied constructors with unpacked fields simplified badly

[GHC]

#12990: Partially applied constructors with unpacked fields simplified badly
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        Reporter:  dfeuer            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:  Inlining
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 No, it's fine. In the example, if we inline C we get
 {{{
 ...(let w = \pq. case x of I# x1
                  case p of I# p1 ->
                  case q of I# q1 ->
                  C x1 p1 q1
     in ...(w p q)...)...
 }}}
 which is fine. The comment was just saying that if we choose ''not'' to
 inline then we do want `w` to see the strictness via `C`'s strictness
 signature.

 So please do give it a try.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12990#comment:7>
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