#9588: Add `MonadPlus (Either e)` and `Alternative (Either e)` instances -------------------------------------+------------------------------------- Reporter: hvr | Owner: hvr Type: task | Status: new Priority: normal | Milestone: ⊥ Component: Core Libraries | Version: Resolution: | Keywords: report-impact Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #10755 #12160 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by Iceland_jack): intended? {{{#!hs $ ghci-8.0.1 GHCi, version 8.0.1: http://www.haskell.org/ghc/ :? for help Loaded GHCi configuration from /apps/strats/.ghci
import Data.Foldable import Control.Applicative import Control.Monad.Trans.Error
<interactive>:1:1: warning: [-Wdeprecations] Module ‘Control.Monad.Trans.Error’ is deprecated: Use Control.Monad.Trans.Except instead
Left "A" <|> Left "B" Left "B" asum [Left "A", Left "B"] Left "" }}}
-- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9588#comment:11 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler