[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
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        Reporter:  Lemming           |                   Owner:  ekmett
            Type:  bug               |                  Status:  patch
        Priority:  highest           |               Milestone:  7.10.1
       Component:  Core Libraries    |                 Version:  7.10.1-rc1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Runtime crash     |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:  #9495             |                Blocking:
                                     |  Differential Revisions:  Phab:D602
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Comment (by Herbert Valerio Riedel <hvr@…>):

 In [changeset:"f44bbc83bab62f9a2d25e69d87c2b4af25318d52/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="f44bbc83bab62f9a2d25e69d87c2b4af25318d52"
 Revert zipWith strictification (re #9949)

 Also remove foldr2/right rule to avoid possibly introducing
 bottoms with rules.

 This effectively reverts most of 488e95b433d4f7568aa89622c729e64aa3b6520d

 Reviewed By: nomeata

 Differential Revision: https://phabricator.haskell.org/D602
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9949#comment:16>
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