lib/parser.js
function step() {
                var f = script.shift();
                if(f) {
                        f(stack, step);
                }
                else {
                    return cb(null, stack.pop());
                }
        }
function step() {
                var f = script.shift();
                if(f) {
                        f(stack, step);
                }
                else {
                    return cb(null, stack.pop());
                }
        }
function step ( ) { var f = script . shift ( ) ; if ( f ) { f ( stack , step ) ; } else { return cb ( null , stack . pop ( ) ) ; } }
Execute the functions asynchronously
Execute the functions asynchronously