Trait for listing symbols in a delegate's closure?

[Dicebot]

On Sunday, 28 April 2013 at 12:30:13 UTC, d coder wrote:
> Greetings
>
> I am wondering if there is a way to find out a tuple of all the
> symbols/identifiers in a given delegates closure.
>
> Regards
> - Puneet

I don't think it is possible. D does not have tools for 
introspection of function bodies, all traits are focused on 
declarations.