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