rust-clippy/tests/ui/manual_str_repeat.rs

64 lines
1.8 KiB
Rust

#![allow(non_local_definitions)]
#![warn(clippy::manual_str_repeat)]
use std::borrow::Cow;
use std::iter::repeat;
fn main() {
let _: String = std::iter::repeat("test").take(10).collect();
let _: String = std::iter::repeat('x').take(10).collect();
let _: String = std::iter::repeat('\'').take(10).collect();
let _: String = std::iter::repeat('"').take(10).collect();
let x = "test";
let count = 10;
let _ = repeat(x).take(count + 2).collect::<String>();
macro_rules! m {
($e:expr) => {{ $e }};
}
// FIXME: macro args are fine
let _: String = repeat(m!("test")).take(m!(count)).collect();
let x = &x;
let _: String = repeat(*x).take(count).collect();
macro_rules! repeat_m {
($e:expr) => {{ repeat($e) }};
}
// Don't lint, repeat is from a macro.
let _: String = repeat_m!("test").take(count).collect();
let x: Box<str> = Box::from("test");
let _: String = repeat(x).take(count).collect();
#[derive(Clone)]
struct S;
impl FromIterator<Box<S>> for String {
fn from_iter<T: IntoIterator<Item = Box<S>>>(_: T) -> Self {
Self::new()
}
}
// Don't lint, wrong box type
let _: String = repeat(Box::new(S)).take(count).collect();
let _: String = repeat(Cow::Borrowed("test")).take(count).collect();
let x = "x".to_owned();
let _: String = repeat(x).take(count).collect();
let x = 'x';
// Don't lint, not char literal
let _: String = repeat(x).take(count).collect();
}
#[clippy::msrv = "1.15"]
fn _msrv_1_15() {
// `str::repeat` was stabilized in 1.16. Do not lint this
let _: String = std::iter::repeat("test").take(10).collect();
}
#[clippy::msrv = "1.16"]
fn _msrv_1_16() {
let _: String = std::iter::repeat("test").take(10).collect();
}