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