#14349: Semigroup/Monoid instances for System.Exit.ExitCode -------------------------------------+------------------------------------- Reporter: neil.mayhew | Owner: (none) Type: feature request | Status: upstream Priority: low | Milestone: Component: libraries/base | Version: 8.2.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by nomeata): I am not yet convinced. Is this the only sensible `Monoid` instance? Do we want to see code that says `returnWith mempty`? Why is leftmost the right thing? Note that it is verymuch noch like `set -e` because `set -e` *stops* after the first error. Maybe a named function `anySuccess :: [ExitCode] -> ExitCode` would be a better design. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14349#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler