[GHC] #9949: zipWith too strict in second argument in GHC-7.10.0

[GHC]

#9949: zipWith too strict in second argument in GHC-7.10.0
-------------------------------------+-------------------------------------
        Reporter:  Lemming           |                   Owner:  ekmett
            Type:  bug               |                  Status:  new
        Priority:  highest           |               Milestone:
       Component:  libraries/base    |                 Version:  7.10.1-rc1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:  #9495             |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------

Comment (by dfeuer):

 My take is that if we revert this change, then we should get rid of the
 `foldr2` rule that prompted it. I do not want to go back to the situation
 where semantics depended on which if either of the rules fired.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9949#comment:7>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler