[plt-scheme] drscheme repl vs mzscheme

From: Noel Welsh (noelwelsh at gmail.com)
Date: Tue Jun 23 05:44:34 EDT 2009

The difference is being inside a module or in the top level.

To answer the question I suspect you're really asking. I.e. how to get
eval working inside a module:

Eval uses the bindings in the current namespace to work out what
values correspond to the symbols in the s-exp being evaled. By default
the namespace inside a module is empty, while at the top level it is
populated with (I think) the bindings from scheme/base

So, to eval inside a module you need to create a namespace that is not
empty. The following program illustrates this:

#lang scheme

(parameterize ([current-namespace (make-base-namespace)])
  (eval '(+ 1 2)))


On Tue, Jun 23, 2009 at 4:30 AM, Skeptic .<skeptic2000 at hotmail.com> wrote:
> Oops, I said REPL, but in fact I run it from the definitions.
> So, real question is what is the difference from definitions vs REPL ;)
> Thanks

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