dead_code

The compiler provides a dead_code lint that will warn about unused functions. An attribute can be used to disable the lint.

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fn used_function() {}
// `#[allow(dead_code)]` is an attribute that disables the `dead_code` lint
#[allow(dead_code)]
fn unused_function() {}
fn noisy_unused_function() {}
// FIXME ^ Add an attribute to suppress the warning
fn main() {
    used_function();
}
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Note that in real programs, you should eliminate dead code. In these examples we'll allow dead code in some places because of the interactive nature of the examples.