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$ cargo build
Compiling guessing_game v0.1.0 (file:///projects/guessing_game)
warning: unused `Result` that must be used
--> src/main.rs:10:5
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10 | io::stdin().read_line(&mut guess);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: this `Result` may be an `Err` variant, which should be handled
= note: `#[warn(unused_must_use)]` on by default
warning: `guessing_game` (bin "guessing_game") generated 1 warning
Finished dev [unoptimized + debuginfo] target(s) in 0.59s
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