============================================
If statements
============================================

if (x)
  log(y);

if (a.b) {
  log(c);
  log(d);
}

----

(program
  (if_statement (identifier)
    (expression_statement (function_call
      (identifier) (identifier))))
  (if_statement (member_access (identifier) (identifier))
    (statement_block
      (expression_statement (function_call
        (identifier) (identifier)))
      (expression_statement (function_call
        (identifier) (identifier))))))

============================================
For statements
============================================

for (i = 0; i < 10; i++)
  log(y);

for (;;) {
  log(y);
}

---

(program
  (for_statement
    (expression_statement (assignment (identifier) (number)))
    (expression_statement (rel_op (identifier) (number)))
    (math_op (identifier))
    (expression_statement (function_call (identifier) (identifier))))

  (for_statement
    (expression_statement)
    (expression_statement)
    (statement_block
      (expression_statement (function_call (identifier) (identifier))))))
    
============================================
Return statements
============================================

return;
return 5;

---

(program
  (return_statement)
  (return_statement (number)))

============================================
Var declarations
============================================

var x = 1;
var x, y = {}, z;

---

(program
  (var_declaration (identifier) (number))
  (var_declaration
    (identifier)
    (identifier) (object)
    (identifier)))