[racket] Check Syntax arrows for #lang languages

Another possibility is that the identifiers that your reader produces
are not syntax-original?. You have to use 'read-syntax' to actually
produce the identifiers to get that mark on them.

There are some unreleased changes to datalog that improve this aspect of it:

http://git.racket-lang.org/plt/commit/bf95ee10523daabea4925073ff035bf57ecad59f

there are few followup commits that clean up that one but not, I
think, relating to this issue.

Robby

On Tue, Jul 3, 2012 at 12:01 PM, Vincent St-Amour <stamourv at ccs.neu.edu> wrote:
> 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.
>
> Vincent
>
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