0(1) element: null
1(2) element: PyTypeParameter
2(3) WRITE ACCESS: T
3(4) element: PyTypeParameter
4(5) WRITE ACCESS: U
5(6) READ ACCESS: T
6(7) WRITE ACCESS: a
7(8) READ ACCESS: U
8(9) WRITE ACCESS: b
9(10) element: PyPassStatement
10() element: null