[racket] Typed racket and hash table

From: Sam Tobin-Hochstadt (samth at cs.indiana.edu)
Date: Fri Jun 27 15:49:14 EDT 2014

On Fri, Jun 27, 2014 at 3:32 PM, Manfred Lotz <manfred.lotz at 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).


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