[racket] disappeared-use syntax property

On Wed, May 29, 2013 at 6:48 AM, Sam Tobin-Hochstadt <samth at ccs.neu.edu>wrote:

> On Wed, May 29, 2013 at 2:43 AM, Eric Dobson <eric.n.dobson at gmail.com>
> wrote:
> > Is it 'wrong' to add a disappeared-use property onto a syntax object
> > even if the use wasn't actually disappeared? Its not very obvious what
> > semantics these syntax properties are supposed to have.
>
> I would take an operational view of the semantics: use the
> 'disappeared-use property if you want DrRacket to draw an arrow to the
> location of that syntax object.
>
>
And DrRacket already has to do a bunch of work to cope with strange results
(including duplicate identifiers) so it shouldn't mind if they both end up
being there.

Robby
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