[flexcoders] How to manually delete references to objects?

[lytvynyuk]

I saw some examples like that:

// create a new object, and put a reference to it in a:
var a:Object = {foo:"bar"}
// copy the reference to the object into b:
var b:Object = a;
// delete the reference to the object in a:
delete(a);

But it definitely wont even compile.

Is there any techniques to do so?