[plt-scheme] I/O therefore no local

Use a teachpack to introduce I/O. There is no connection between I/O and local definitions. 


On Mar 1, 2010, at 5:18 AM, wooks wrote:

> 1. I need to introduce my students to I/O.
> 2. I need to introduce my students to local.
> 3. The teaching languages do not support I/O.
> 4. If I introduce local now I will have to switch to let when teaching
> I/O.
> 
> Conclusion - teach let instead of local?
> 
> 
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