[plt-dev] Release Announcement for v4.2.2

From: Jon Rafkind (rafkind at cs.utah.edu)
Date: Tue Sep 29 16:56:59 EDT 2009

> * new `scheme/generator' library
>   - make generators use a parameterized yield function
>
> * new `in-producer' iteration
>   

* new `scheme/generator' library allows for coroutine style iterators
* new `in-producer' form that makes `scheme/generator' available inside 
`for' style iteration


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