0(1) element: null
1(2) element: PyWithStatement
2(4) READ ACCESS: context_manager
3(15) exit context manager: context_manager
4(5,3) element: PyIfStatement
5(6,7,3) READ ACCESS: c
6(12) element: null. Condition: c:false
7(8) element: null. Condition: c:true
8(3,9) ASSERTTYPE ACCESS: c
9(10) element: PyStatementList
10(11,3) raise: PyRaiseStatement
11(17,3) READ ACCESS: ValueError
12(13,3) element: PyAssignmentStatement
13(14,3) READ ACCESS: c
14(15,3) WRITE ACCESS: val
15(16) element: PyPrintStatement
16(17) READ ACCESS: val
17() element: null