On Fri, Jun 27, 2014 at 3:32 PM, Manfred Lotz <manfred.l...@arcor.de> wrote:
>
> Argument 3:
>   Expected: (-> b)
>   Given:    False


This is the key part of the error message: you have to provide a
function as the third argument, and you provided `#f`. I'd just change
that to (lambda () #f).

Sam
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