[plt-scheme] Scope of eval?

On 9/30/07, Jakub Piotr Cłapa <jpc at pld-linux.org> wrote:

> Carl Eastlund wrote:

> > Eval only works on global variables.  In your example, x is a field
> > bound in a specific object.

> If you want to eval in some other context either wrap it with a lambda
> and call the returned value or play with namespace-* functions.

How would I use lambda to go about getting the desired effect?