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$ cargo run
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Compiling iterators v0.1.0 (file:///projects/iterators)
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warning: unused `Map` that must be used
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--> src/main.rs:4:5
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4 | v1.iter().map(|x| x + 1);
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| ^^^^^^^^^^^^^^^^^^^^^^^^
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= note: iterators are lazy and do nothing unless consumed
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= note: `#[warn(unused_must_use)]` on by default
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help: use `let _ = ...` to ignore the resulting value
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4 | let _ = v1.iter().map(|x| x + 1);
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| +++++++
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warning: `iterators` (bin "iterators") generated 1 warning
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Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.47s
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Running `target/debug/iterators`
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