[racket] Check Syntax arrows for #lang languages

From: Vincent St-Amour (stamourv at ccs.neu.edu)
Date: Tue Jul 3 13:01:38 EDT 2012

At Tue, 3 Jul 2012 17:47:57 +0200,
Jens Axel Søgaard wrote:
> However there is one thing missing. After clicking the check syntax
> button in DrRacket I do not get any arrows showing bindings.
> Obviously I must have missed something, but what?
> Is something required to turn on the arrows?

If your language implementation discards identifiers, you can use the
`disappeared-use' and `disappeared-binding' syntax properties to get
arrows back.


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