Austin is sometimes in the habit of removing the contents, such as at the start of his email.src script:
Code:
program EmailClient(params)
var mobile := params[1];
var box_id := params[2];
var send_to := params[3];
var subject := params[4];
var message := params[5];
params := 0; // Not needed anymore.
That's as close as I've seen. You may not be able to release the variable name and the pointer, but you can remove the data.