1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
7. 7
8. 8
9. 9
10. 10
11. 11
12. 12
13. 13
14. 14
15. 15
16. 16
17. 17
18. 18
19. 19
20. 20
21. 21
22. 22
23. 23
24. 24
25. 25
26. 26
27. 27

===========
Expressions
===========

void main() {
    3 + b.c;
    a in b();
    3 = 3;
}

---

(source_file
  (namespace_member
    (method_declaration
      (type_weak)
      (identifier)
      (block
        (arithmetic_expression
          (literal (integer))
          (member_access_expression (identifier) (identifier)))
        (in_expression 
          (member_access_expression (identifier))
          (method_call_expression (member_access_expression (identifier))))
        (assignment_expression
          (literal (integer))
          (literal (integer)))))))