0(1) element: null
1(2) element: PyWithStatement
2(4) READ ACCESS: context_manager
3(10) exit context manager: context_manager
4(5,3) element: PyAssertStatement
5(6,3) READ ACCESS: False
6(7,3) READ ACCESS: f
7(8,3) element: PyCallExpression: f
8(11,3) raise: PyAssertStatement
9(10,3) element: PyPrintStatement
10(11) element: PyPrintStatement
11() element: null