[GHC] #15226: GHC doesn't know that seq# produces something in WHNF

[GHC]

#15226: GHC doesn't know that seq# produces something in WHNF
-------------------------------------+-------------------------------------
        Reporter:  dfeuer            |                Owner:  (none)
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.4.3
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Runtime           |            Test Case:
  performance bug                    |  perf/should_run/T15226, 15226a
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D4796
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by simonpj):

 I'm going to re-open this because there are two loose ends:

 * Should `seq#` be strict?  See comment:10
 * Is it worth doing the "binder-swap" thing?  See comment:6 and following.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15226#comment:21>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler