| $ cargo run | |
| Compiling cons-list v0.1.0 (file:///projects/cons-list) | |
| Finished dev [unoptimized + debuginfo] target(s) in 0.53s | |
| Running `target/debug/cons-list` | |
| a initial rc count = 1 | |
| a next item = Some(RefCell { value: Nil }) | |
| a rc count after b creation = 2 | |
| b initial rc count = 1 | |
| b next item = Some(RefCell { value: Cons(5, RefCell { value: Nil }) }) | |
| b rc count after changing a = 2 | |
| a rc count after changing a = 2 |