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From: Stefan Israelsson Tampe
Subject: srfi-72
Date: Fri, 18 Jan 2013 23:36:12 +0100

Heya guilers!

I just packaged a small package to enable a reader extension #.
that should be a replacement of #, in #` syntactic forms.

The #. form will pick up the sourunding syntactic environment inside
any #` forms specified e.g. consider

Example (from the srfi-72 documentation):

(use-module (ice-9 syntax-closure))
(let-syntax ((main (lambda (form)                       
                       (define (make-swap x y)
                          (let ((t #,x))
                            (set! #,x #,y)
                            (set! #,y   t))))
                        (let ((s 1)
                              (t 2))
                          #.(make-swap #`s #`t)
                          (list s t))))))

==> (2 1)
In this example #`s will refer to the let bound 's'  which is not the case
if we instead would have used #, #`s would refere to an outer 's'

If we instead had used #, the swap would not happend.

You may find it at

Have fun!


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