On Wed, Oct 19, 2011 at 8:07 PM, Captain Freako <capn.freako@gmail.com> wrote:

One more question on the `runAuto' code, John:

If I understand the code correctly, `f' is an arrow. Yet, we're using
it on the right side of `=' in a simple assignment. How are we getting
away with that?

Thanks,
-db

liftAu' f s0 = proc x -> do
rec (y,s') <- arr f -< (x,s)
s <- delay s0 -< s'
returnA -< (y,s)

The value `f` is a function - a parameter of liftAu'. While all functions are arrows (Arrow is defined on (->)), the value `arr f` is an arrow of the automaton model. The `=` symbol is used to define the liftAu function. What are you imagining?