==========================================
parses multiple statements
==========================================
var x = {};
{};
---
(program
    (statement (assignment (identifier) (expression (literal (object)))))
    (statement (expression (literal (object)))))

==========================================
parses if statements
==========================================
if (1) {
    var x = 2;
}
---
(program
    (statement (if
        (expression (literal (number)))
        (block (statement (assignment (identifier) (expression (literal (number)))))))))