#9330: Introduce shortcut for "on (==)" much like there's a shortcut for "on compare". -------------------------------------+------------------------------------- Reporter: frerich | Owner: Type: feature | Status: new request | Milestone: Priority: normal | Version: 7.8.2 Component: | Keywords: libraries/base | Operating System: Unknown/Multiple Resolution: | Type of failure: None/Unknown Differential Revisions: | Test Case: Architecture: | Blocking: Unknown/Multiple | Difficulty: Unknown | Blocked By: | Related Tickets: | -------------------------------------+------------------------------------- Comment (by ekmett): A couple of items: Historically, `comparing` was actually defined before `on` was added to `base`. Fear that we'd be duplicating that pattern over and over again for every other function under the sun led to the adoption of `on`. `equating` was explicitly the original motivation! `comparing` was left in because it was already there, but not _really_ intended to be a pattern to copy, `on` was the general solution put forth to avoid precisely this repetition. The main reason why we should consider doing this is, well, frankly, it gets reinvented every 6 months, so by not doing it we seem to be on the wrong side of history. Eventually someone will say yes. ;) That said, library changes like this should go through a libraries@haskell.org request, rather than trac. Please submit this as a libraries@ mailing list proposal, that'll garner general sentiment and the core libraries committee can weigh in there. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9330#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler