[plt-scheme] evaluating buffer w/o re-initializing environment?

http://list.cs.brown.edu/pipermail/plt-scheme/2007-June/018806.html

On Sun, Mar 29, 2009 at 11:20 AM, Fred G. Martin <fredm at cs.uml.edu> wrote:
> Dear PLT-Scheme'rs,
>
> One of the things I really miss in Dr. Scheme is the ability to add
> new definition bindings without losing the state of the global
> environment.  When you evaluate a buffer with F5 or Run, the world is
> reset and then the buffer definitions are evaluated and put back.
>
> Am I missing something easy, or is this a deep design decision?  I
> wish I could introduce my students to the Lisp programming methodology
> of iteratively building up the objects in one's world and the
> procedures for interacting with them.
>
> Fred
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