This was a bit baffling too. It appears that there's an implied argument to runTick. This also works and makes it more explicit. I suppose the compiler just works out that the only place to put the 'n' is after tick. runTick :: Int -> (String,Int) runTick n = runState tick n ----- Original Message ---- From: Arie Peterson To: haskell-cafe@haskell.org Sent: Monday, July 2, 2007 4:51:59 PM Subject: Re: [Haskell-cafe] Very simple parser To get you going, start with the example from the documentation, modified slightly:

tick :: State Int String tick = do n <- get put (n+1) return (show n)

If you want to actually run 'tick', use the 'runState' function:

runTick :: Int -> (String,Int) runTick = runState tick

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