Re: [Haskell-cafe] Question on `runState'

On Mon, Oct 17, 2011 at 5:32 PM, Conrad Parker wrote:

On 17 October 2011 23:59, Captain Freako wrote:

...

In this excerpt from the `StateArrow' page:

runState :: Arrow a => StateArrow s a e b -> a (e, s) (b, s)Source

what's the significance of having written "StateArrow s a e b", instead of "StateArrow s a b c"?

In the context of that page, do you think e might stand for something?

btw. what's the URL?

http://hackage.haskell.org/packages/archive/arrows/0.4.1.2/doc/html/Control-... I think maybe b is for beginning and e is for end?