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