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rust/tests/ui/unused-crate-deps/libfib.rs

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Implement warning for unused dependencies. This will print a diagnostic for crates which are mentioned as `--extern` arguments on the command line, but are never referenced from the source. This diagnostic is controlled by `-Wunused-crate-dependencies` or `#![warn(unused_crate_dependencies)]` and is "allow" by default. There are cases where certain crates need to be linked in but are not directly referenced - for example if they are providing symbols for C linkage. In this case the warning can be suppressed with `use needed_crate as _;`. Thanks to @petrochenkov for simplified core. Resolves issue #57274
2020-05-17 01:48:01 -07:00
// Test warnings for a library crate
// check-pass
// aux-crate:bar=bar.rs
// compile-flags:--crate-type lib -Wunused-crate-dependencies
pub fn fib(n: u32) -> Vec<u32> {
//~^ WARNING external crate `bar` unused in
let mut prev = 0;
let mut cur = 1;
let mut v = vec![];
for _ in 0..n {
v.push(prev);
let n = prev + cur;
prev = cur;
cur = n;
}
v
}
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