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$ 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
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