Brian Hurt wrote:
The second question I have is: is there any hope of getting something
like this into the standard library?
the newtype Identity in module Control.Monad.Identity in package `mtl`
is what you describe:
http://www.haskell.org/ghc/docs/latest/html/libraries/mtl/Control-Monad-Identity.html
in other words, it already is practically in the standard library.
The type-synonym technique doesn't work very well because, e.g., is
(TrivialMonad (IO ())) ">>=" an IO function or a Trivial function? It
has been thoroughly discussed before, IIRC...
~Isaac
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