#12160: MonadFail instance for (Either String)? -------------------------------------+------------------------------------- Reporter: lexi.lambda | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: libraries | Version: 8.0.1 (other) | 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 lexi.lambda): Ah, that’s a good point, though I don’t think I agree with it. I’m imagining `text` defining a `MonadFail (Either Text)` instance, for example, and it seems like it wouldn’t be all that worth it to prevent that kind of instance just to help out type inference in a couple cases. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12160#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler