how to verify that the AST is empty?

[BctfN0HUK7Yg]

how to verify that the AST is empty?

[schungx]

Why would you want to do that?

Perhaps iterate the statements and counting them? You'd need the internals feature.

Beware that a script can become empty after optimization after Rhai removes all unnecessary statements so it depends on what you define as empty.

Alternately you can just check whether a script is empty, but you'll get tripped up by comments.

[BctfN0HUK7Yg]

to check if the script needs to be compiled in ast or if it has already been done

[schungx]

If you already have an AST then you should have compiled a script already... This is a poor way to detect whether a script is there because some scripts compile down to an empty AST.

You can try using Option<AST> if you need to be sure.