[racket] Metaprogramming with scheme

From: Valeriya Pudova (valery at digitalchile.net)
Date: Tue Jun 22 02:40:23 EDT 2010

>> The continuation marks included in the exception are effectively a
>> stack trace, and you can convert them into locations. See the docs.
> :) Reading about continuation marks.

Great feature those continuation marks. But does not looks helpful this 
To be able to get mark i should set it before. Is it not?
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