1Checking classes
2Is Structurally modifiable class Main$C1 true
3Is Structurally modifiable class Main$C2 true
4Is Structurally modifiable class Main$C3 true
5Setting C2 as having pointer-ids used and checking classes
6Is Structurally modifiable class Main$C1 false
7Is Structurally modifiable class Main$C2 false
8Is Structurally modifiable class Main$C3 true
9