Re: Breaking hygiene with syntax-rules?

[Dr. Arne Babenhauserheide]

Jean Abou Samra <jean@abou-samra.fr> writes:

> This is a known limitation in Guile. Please read
> https://www.gnu.org/software/guile/manual/html_node/Hygiene-and-the-Top_002dLevel.html

I would not expect that effect from the description, because in

(define-syntax unhygienic
  (syntax-rules ()
    ((_ the-pair fetch)
     (begin
       (define the-head (car the-pair))
       (define (the-proc) the-head)
       (define (fetch) the-head)))))

the-head depends on (car the-pair) and the-pair is a variable passed to
the macro. So I would expect this to create different identifiers for
different values of the-pair, just like it creates different identifiers
when instead of (car the-pair) I use fetch (also passed from outside).

Best wishes,
Arne
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