[racket] Check Syntax arrows for #lang languages

Hi All,

The experience of implementing a #lang based language have been pleasant.
It is impressing just how painless the macro/module system and DrRacket
works together.

So far my custom language has:
  - parser with source location
  - syntax errors with source location
  - color lexer to color source in DrRacket
  - custom repl

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?

I have looked some at the algol60 and datalog languages, but I can't
spot what I am missing.

Is it required to register the language as a tool?

-- 
Jens Axel Søgaard
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