[plt-scheme] 'eval' function seems to completely ignore scopingrules.

Eli wrote:

> `eval' is still needed, IMO.  The only bad thing about it is that
> newbies tend to use it much much more frequently than needed.

In the two places it has come up for me, the code using it was supplied 
by Noel and Eli, respectively. Noel's involved describing and then 
creating Web pages using a DSL defined by macros. The use of eval is 
described in the Scheme Cookbook:

http://schemecookbook.org/Cookbook/DynamicEvalCustomNamespace

Eli's involved evaluating student code in a safe manner and with certain 
functions predefined. He has made this into sandbox.ss in the MzLib library.

In both these cases, something that is either code or looks very much 
like it is residing in a separate file and needs to be evaluated. I 
haven't needed eval in a context where scope at a narrower level needs 
to be taken into account. To talk about what might replace it in such a 
context, one really needs specific examples. --PR