[GHC] #13086: (\\) in Data.List uses foldl instead of foldl'

[GHC]

#13086: (\\) in Data.List uses foldl instead of foldl'
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           Reporter:  vaibhavsagar   |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:                 |           Version:  8.0.1
  libraries/base                     |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 The list difference operator `(\\)` is currently defined in terms of
 `foldl`:
 https://hackage.haskell.org/package/base-4.9.0.0/docs/src/Data.OldList.html#%5C%5C.
 Should it be using `foldl'` instead?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13086>
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