[racket] Adding raw string syntax

> > The @ syntax originally designed for Scribble is very helpful for
> > this sort of thing.
> 
> A concrete example for using it as a raw string:
> 
>   #lang at-exp racket
>   (define r string-append)
>   (display @r{...nearly free text here...})
> 
Aha! So there it was! Thanks a lot for the pointer! Ignorance is
always ignorance, but... I can't help thinking that if I had known
that I would have missed a lot of fun ;)