[plt-scheme] Using generated names for top-level bindings

From: Gregory Cooper (greg at cs.brown.edu)
Date: Wed Sep 15 22:04:26 EDT 2004

I ran into this problem a few months ago.  I'm not sure if it's intended
behavior or not, but I worked around it by using 'datum->syntax-object'
instead of just 'syntax' for the argument to 'generate-temporaries'.
This seemed to give the generated ids a suitable lexical environment.


On Wed, 15 Sep 2004, Andre van Tonder wrote:

>   For list-related administrative tasks:
>   http://list.cs.brown.edu/mailman/listinfo/plt-scheme
> Is the following error legitimate?
> (define-syntax test
>    (lambda (stx)
>      (syntax-case stx ()
>        ((_) (with-syntax ((name (car (generate-temporaries
>                                         (list (syntax _))))))
>               (syntax (begin
>                         (define name 1)
>                         (display name))))))))
> (test)
>    ==> compile: bad syntax; reference to top-level identifiers is not
>        allowed, because no #%top syntax transformer is bound in: test13
> I know how to use gensym to do it, but par 14.6 of the Help Desk appears
> to discourage it: "...do not use gensym or string->uninterned-symbol to
> construct an identifier for a top-level or module binding."
> Andre

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