[plt-scheme] errata HTDP 22.3 code in fig 63

Same section of the book.

<quote>How all this works is best illustrated with examples. Our first 
example is a canonical GUI program:

(create-window (list (list (make-button "Close" hide-window))))

It creates a window with a single button and equips it with the simplest of 
all call-backs: hide-window, the function that hides the window. When the 
user clicks the button labeled "Close", the window disappears.</quote>

Executing this code while running on Intermediate Student with lambda yields 
an error.

"hide-window: expected <window> as its argument, given: (instantiate (class 
...) ...)"







>From: Matthias Felleisen <matthias at ccs.neu.edu>
>To: "wooks ." <wookiz at hotmail.com>
>CC: plt-scheme at list.cs.brown.edu
>Subject: Re: [plt-scheme] errata HTDP 22.3 code in fig 63
>Date: Thu, 20 Jul 2006 13:59:46 -0400
>
>This is a problem in the type-setting software for the on-line  version. If 
>this is in print, let me know.
>
>On Jul 20, 2006, at 1:19 PM, wooks . wrote:
>
>>
>>Shouldn't
>>
>>number-> string
>>
>>actually be
>>
>>number->string
>>
>>
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>