Represents some form of expression to find a value

@param {String} data The code to parse
@param {Function} define
function ExpressionStatement(data, define) {
    this.child = parseExpression(data, define ? define.line : 'unknown');

    if (this.child instanceof SyntaxError) throw this.child;
    else if (this.child.error) throw this.child.error;
}