Function expression

front-end/UglifyJS/parse-js.js:1163–1172

(commas)

        };

        function expression(commas) {
                if (arguments.length == 0)
                        commas = true;
                var expr = maybe_assign();
                if (commas && is("punc", ",")) {
                        next();
                        return as("seq", expr, expression());
                }
                return expr;
        };

        function in_loop(cont) {
                try {