Thanks, that's very informative!

On Fri, Feb 3, 2017 at 10:38 AM, Dupéron Georges <
jahvascriptman...@gmail.com> wrote:

> Le vendredi 3 février 2017 11:28:47 UTC+1, Laurent Orseau a écrit :
> > I see. So basically all #% things are extension points?
> > The list for the racket language:
> >
> > http://docs.racket-lang.org/search/index.html?q=%23%25%20L%3Aracket
>
> I think #% just means "low-level".
> * #%declare,  #%expression, #%require, #%provide and #%variable-reference
> are built-in forms with special meanings, and it does not really make sense
> to override them.
> * #lang racket/base overrides #%app, and re-provides the original as
> #%plain-app, so it is just an alias for the #%app from the '#%kernel. The
> same goes for #%plain-lambda.
> * #%app, #%datum, #%module-begin, #%top and #%top-interaction are
> extension points (for function calls, self-quoting data, handling the body
> of the entire module, unbound variables and REPL interactions, respectively)
> * I'm not 100% sure if #%stratified-body, #%plain-module-begin and
> #%printing-module-begin can be overridden in a useful way or not.
>
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