I think what happens is that when you use the language with the repl it ignores 
the reader and just looks at the exports from the language (main.rkt).

On Thursday, May 25, 2017 at 10:14:58 AM UTC-6, Dmitry Pavlov wrote:
> Vityou,
> 
>     
> 
>     I will give you an example though I myself sometimes doubt that I
>     did it in the right way.
> 
>     
> 
>     Anyway, here is what I did when I had exactly the same problem:
> 
>     
> 
>     - redefine and reexport #%
>     
>     top-interaction
> 
>     - provide #:language-info to the DrRacket's REPL (I am not sure if
>     racket's REPL needs it too, but doing it will not hurt). The
>     provided call should respond to 'configure-runtime key 
> 
>     - the 'configure-runtime should trigger a setting of
>     (current-read-interaction) parameter.
> 
>     - at the end of the implementation of (current-read-interaction), it
>     should set another (current-read-interaction) that just returns EOF
>     -- and then sets the original (current-read-interaction) back, so it
>     is kind of a loop.
> 
>     
> 
>     The example (made long ago) is available at:
>     https://github.com/kugelblitz/calc
> 
>     
> 
>     Relevant parts:
> 
>     /language.rkt (see top-interaction)
> 
>     /lang/reader.rkt (reference to lang-info)
> 
>     /lang/lang-info.rkt (calling of "configure runtime" handler)
> 
>     /lang/configure-runtime.rkt (the handler itself)
> 
>     
> 
>     Hope this helps.
> 
>     
> 
>     Dmitry
> 
>     
> 
>     
> 
>     
> 
>     
> On 05/18/2017 06:45 AM, Vityou wrote:
> 
>     
>     
>       I did reprovide all of the #%... forms from racket, and the repl works 
> with base.rkt, it's when I have a reader that the repl doesn't work.

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