> On Mar 20, 2017, at 2:59 AM, Jan Hondebrink <jrhondebr...@gmail.com> wrote:
> Testing top-interaction with expression: (#%top-interaction + 1 2)
> . +: unbound identifier;
> also, no #%app syntax transformer is bound in: +
> So when you pass an expression through to the racket/base #%module-begin, it 
> can use the racket/base bindings, but if you pass an expression through to 
> the racket/base #%top-interaction it cannot. How can you make 
> #%top-interaction use the racket/base bindings?

When you start a source file with this line:

#lang s-exp "ME-expander.rkt"

You are telling Racket to 1) parse the code into expressions using the default 
`s-exp` (aka Racket-style) reader and 2) use "ME-expander.rkt" as the expander 

The expander module supplies the initial set of bindings for the code. 
Conversely, if the expander doesn't provide a certain binding, the code can't 
use it, and you get an unbound-identifier error.

Even though "ME-expander.rkt" is written with `#lang racket/base`, it does not 
automatically export the bindings from `racket/base`. If that's the behavior 
you want, you need to add this to "ME-expander.rkt":

(provide (all-from-out racket/base))

Though you have to be a little careful if you plan to override bindings from 
`racket/base` with your own (say, `#%top-interaction` and `#%module-begin`). In 
that case, you can omit those bindings with `except-out`:

(provide (except-out (all-from-out racket/base) #%top-interaction 

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