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warning: external crate `bar` unused in `libfib`: remove the dependency or add `use bar as _;`
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--> $DIR/libfib.rs:7:1
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LL | pub fn fib(n: u32) -> Vec<u32> {
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| ^
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= note: requested on the command line with `-W unused-crate-dependencies`
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warning: 1 warning emitted
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