#7913: Argument order not preserved by nubBy -------------------------------------+------------------------------------- Reporter: paullik | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Prelude | Version: 7.6.3 Resolution: | Keywords: nubBy Operating System: Linux | Architecture: Unknown/Multiple Type of failure: | Difficulty: Unknown None/Unknown | Blocked By: Test Case: | Related Tickets: Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by Herbert Valerio Riedel <hvr@…>): 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 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7913#comment:5> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler