How can you re-define a constant identifier in DrScheme?

Question

I am using DrScheme to write a Scheme interpreter. I define a Read Eval Print Loop and I am re-defining the eval procedure. This works fine in other scheme implementations l

Answer 1

It turns out there are options per each language and one of them is "Disallow redefinition of initial bindings" which can be unchecked.

Answer 2

You're probably using the "Pretty Big" language. Switch to "Module", and you can do it.