[Haskell-cafe] Newclasses

John Lato jwlato
Fri Oct 4 00:53:06 UTC 2013

I don't really understand what a "newclass" is supposed to be.

On Thu, Oct 3, 2013 at 2:15 PM, Wvv <vitea3v at rambler.ru> wrote:

>     newclass Bind a => Monad a => BMonad a where { (>>=) = (>>-) }

I think this means that `BMonad` is supposed to be a new class that has
both Bind and Monad in scope, the same as

  class (Bind a, Monad a) => BMonad a

except that the Monad instance's (>>=) is replaced by (>>-).

If that's what "newclass" means, it seems absolutely pointless.

Does it instead mean that one could write

  instance Bind MyType where

  instance BMonad MyType
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