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
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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