#10457: Revise/remove custom mapM implementation for lists -------------------------------------+------------------------------------- Reporter: dolio | Owner: Type: task | Status: closed Priority: normal | Milestone: 8.0.1 Component: libraries/base | Version: 7.10.1 Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D1124 Wiki Page: | -------------------------------------+------------------------------------- Comment (by nomeata): JFTR: This instance of the regression has been fixed, because the `State` implementation got a sensible `Applicative` instance. The change in changeset:60297486/ghc still has the ability to regress any user code that has `(<*>) = ap`. OTOH, there is little we can do about it besides telling people to implement their Applicatives properly. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10457#comment:20 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler