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