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$ cargo run
Compiling closure-example v0.1.0 (file:///projects/closure-example)
Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.43s
Running `target/debug/closure-example`
Before defining closure: [1, 2, 3]
Before calling closure: [1, 2, 3]
From closure: [1, 2, 3]
After calling closure: [1, 2, 3]