[plt-scheme] paired braces in interaction mode?

It was clearly explained on this list how its works, IIRC by Robby Findler.
It is a simple thing that hardly needs documentation.
I can imagine that at this moment PLT people have many things higher on 
their list of priorities.
Sorry being a little bit obtrusive. Take it with a :) please.
Jos
----- Original Message ----- 
From: "Grant Rettke" <grettke at acm.org>
To: "Robby Findler" <robby at cs.uchicago.edu>
Cc: "PLT Scheme Mailing List" <plt-scheme at list.cs.brown.edu>
Sent: Thursday, March 06, 2008 2:27 AM
Subject: Re: [plt-scheme] paired braces in interaction mode?


> On Tue, Mar 4, 2008 at 9:03 PM, Grant Rettke <grettke at acm.org> wrote:
>>  I don't really understand how this feature is supposed to work or why
>>  someone would want it, though the folks in the thread understand, so I
>>  was hoping there would be a place in the manual that would explain
>>  this feature.
>
> "it was a convenient feature of the interaction mode when a
> previously evaluated S-expression could be copied into editing position by
> putting a cursor on this expression and pressing enter."
>
> *That* is what I didn't understand, though somehow I managed to
> totally confuse myself and perhaps others.
>
> After downloading 3.99.0.17-svn4mar2008 and seeing what S-expression
> matching meant (the obvious of course but somehow I didn't get it) I
> looked at this feature of hitting enter and copying.
>
> Here is how it works, in the repl type:
>
> (+ 1 2)
> hit enter
> (+ 1 2
> ;; now move the cursor up to the RIGHT parentheses of the previous
> expression and hit enter
> ;; you end up with
> (+ 1 2 (+ 1 2)
>
> That should be mentioned somewhere in the user guide or no one will
> ever use the feature.
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