#14200: Deprecate WrappedMonad -------------------------------------+------------------------------------- Reporter: siddhanathan | Owner: (none) Type: task | Status: new Priority: normal | 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: #13876 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by RyanGlScott): * cc: hvr, ekmett, core-libraries-committee@… (added) * related: => #13876 Comment: I'm inclined to agree here. At one point in time, where `return` was a canonical class method of `Monad`, it was commonplace to define `Applicative` and `Functor` methods entirely in terms of `Monad` methods. But now `return = pure`, and there are [https://ghc.haskell.org/trac/ghc/wiki/Proposal/MonadOfNoReturn plans] to eventually remove `return` as a class method of `Monad` entirely. When this happens, `WrappedMonad` won't be nearly as useful as it once was, since one won't be able to define `Applicative(pure)` from an arbitrary `Monad` instance anymore (see also #13876). This makes the utility of a `WrappedMonad` newtype dubious. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14200#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler