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#![warn(clippy::repeat_vec_with_capacity)]
fn main() {
{
(0..123).map(|_| Vec::<()>::with_capacity(42)).collect::<Vec<_>>();
//~^ ERROR: repeating `Vec::with_capacity` using `vec![x; n]`, which does not retain capacity
}
{
let n = 123;
(0..n).map(|_| Vec::<()>::with_capacity(42)).collect::<Vec<_>>();
//~^ ERROR: repeating `Vec::with_capacity` using `vec![x; n]`, which does not retain capacity
}
{
macro_rules! from_macro {
($x:expr) => {
vec![$x; 123];
};
}
// vec expansion is from another macro, don't lint
from_macro!(Vec::<()>::with_capacity(42));
}
{
std::iter::repeat_with(|| Vec::<()>::with_capacity(42));
//~^ ERROR: repeating `Vec::with_capacity` using `iter::repeat`, which does not retain capacity
}
{
macro_rules! from_macro {
($x:expr) => {
std::iter::repeat($x)
};
}
from_macro!(Vec::<()>::with_capacity(42));
}
}
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