Method constructor

src/helpers/parser.js:7–13

(message, expected, found, location)

class peg$SyntaxError extends SyntaxError {
    constructor(message, expected, found, location) {
        super(message);
        this.expected = expected;
        this.found = found;
        this.location = location;
        this.name = "SyntaxError";
    }

    format(sources) {
        let str = "Error: " + this.message;