rust/tests/ui/vec.rs

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// run-rustfix
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#![warn(clippy::useless_vec)]
#[derive(Debug)]
struct NonCopy;
fn on_slice(_: &[u8]) {}
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#[allow(clippy::ptr_arg)]
fn on_vec(_: &Vec<u8>) {}
struct Line {
length: usize,
}
impl Line {
fn length(&self) -> usize {
self.length
}
}
fn main() {
on_slice(&vec![]);
on_slice(&[]);
on_slice(&vec![1, 2]);
on_slice(&[1, 2]);
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on_slice(&vec![1, 2]);
on_slice(&[1, 2]);
#[rustfmt::skip]
on_slice(&vec!(1, 2));
on_slice(&[1, 2]);
on_slice(&vec![1; 2]);
on_slice(&[1; 2]);
on_vec(&vec![]);
on_vec(&vec![1, 2]);
on_vec(&vec![1; 2]);
// Now with non-constant expressions
let line = Line { length: 2 };
on_slice(&vec![2; line.length]);
on_slice(&vec![2; line.length()]);
for a in vec![1, 2, 3] {
println!("{:?}", a);
}
for a in vec![NonCopy, NonCopy] {
println!("{:?}", a);
}
}