> On Nov 6, 2019, at 1:10 PM, John Cowan <xxxxxx@ccil.org> wrote:
>
> If you are willing to quote them when used as expressions (as in Kawa and Racket), it *is* easy, and I can add that to the lexical docket.  But self-evaluation is the part that's going to require work.

Could you explain why you think it is harder than adding a test like this:

  (define (self-evaluating? expr)
    (or (boolean? expr)
        (number? expr)
        (string? expr)
        (char? expr)
        (vector? expr)
        (keyword? expr) ;; added to support self-evaluating keywords
        …))

Marc