Error with define in Racket

Question

I just discovered Racket a few days ago, and I\'m trying to get more comfortable with it by writing a little script that generates images to represent source code using #l

Answer 1

Here's more details, from the Racket docs.

The different contexts are required because macros must expand differently, depending on which language forms are allowed.

As others have said, definitions are not allowed in expression contexts ("expr ..." in the docs), but are ok in other contexts.

In other doc entries, "body ..." indicates an internal-definition context (guide, reference), for example in lambda bodies, and "form ..." indicates all non-expression contexts, like in the docs for begin.