[plt-dev] Release Announcement for v4.2.4

From: Eli Barzilay (eli at barzilay.org)
Date: Wed Jan 27 21:09:41 EST 2010

I'm assuming that this includes the two blurbs from Robby.  Also, what
about the other lang changes?  (`error' seems to have been confusing
enough to have some mention, no?)

On Jan 27, Matthias Felleisen wrote:
> I recommend the following wording:
> * 2htdp/universe: We have severed the intimate connection between  
> universe and the image library. The most important change is that the  
> design of world programs now demands the use of _two_ teachpacks:  
> 2htdp/universe and htdp/image (the old image library) or 2htdp/image  
> (the new image library). Furthermore, the callbacks for world programs  
> no longer use symbols but strings. The image functions are overloaded  
> so that both strings and symbols work as inputs.
> For upgrading your world programs, see the new Porting World Programs  
> guide in the HtDP/2e section of the documentation.
> * htdp/world: The old world teachpack remains deprecated. HtDP/2e  
> exclusively uses the new 2htdp/universe library. For backwards  
> compatibility, the world teachpack will remain in the distribution  
> until the coming summer.

          ((lambda (x) (x x)) (lambda (x) (x x)))          Eli Barzilay:
                    http://barzilay.org/                   Maze is Life!

Posted on the dev mailing list.