Re: [GHC] #3280: The order of arguments to the function passed to nubBy got swapped somehow

7 Nov 2014

      #3280: The order of arguments to the function passed to nubBy got swapped somehow
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        Reporter:  guest             |         Owner:
            Type:  bug               |        Status:  closed
        Priority:  normal            |     Milestone:  6.12.1
       Component:  libraries/base    |       Version:  6.10.3
      Resolution:  wontfix           |      Keywords:
Operating System:  Unknown/Multiple  |  Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |    Difficulty:  Unknown
       Test Case:                    |
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Comment (by Herbert Valerio Riedel ):

 In [changeset:"a2e7bbfe7656cf7dbf1af4da5c077ac0b5d41127/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="a2e7bbfe7656cf7dbf1af4da5c077ac0b5d41127"
 Preserve argument order to (==)/eq in nub and nubBy

 This makes nub and nubBy behave as specified in the Haskell 98 Report.

 This reverts 0ad9def53842e86fb292eccb810190711c42d7c5, and
 fixes #3280, #7913 and #2528 (properly).

 Before this change, the output of `T2528` was (4x wrong):
 ```
 [A,B]
 [1,2]
 False
 False
 ```

 Reviewed By: dfeuer, ekmett, austin, hvr

 Differential Revision: https://phabricator.haskell.org/D238
 }}}

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Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/3280#comment:5
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