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#![warn(clippy::iter_overeager_cloned, clippy::redundant_clone, clippy::filter_next)]
#![allow(dead_code, clippy::let_unit_value, clippy::useless_vec)]
fn main() {
let vec = vec!["1".to_string(), "2".to_string(), "3".to_string()];
let _: Option<String> = vec.iter().cloned().last();
let _: Option<String> = vec.iter().chain(vec.iter()).cloned().next();
let _: usize = vec.iter().filter(|x| x == &"2").cloned().count();
let _: Vec<_> = vec.iter().cloned().take(2).collect();
let _: Vec<_> = vec.iter().cloned().skip(2).collect();
let _ = vec.iter().filter(|x| x == &"2").cloned().nth(2);
let _ = [Some(Some("str".to_string())), Some(Some("str".to_string()))]
.iter()
.cloned()
.flatten();
let _ = vec.iter().cloned().filter(|x| x.starts_with('2'));
let _ = vec.iter().cloned().find(|x| x == "2");
{
let f = |x: &String| x.starts_with('2');
let _ = vec.iter().cloned().filter(f);
let _ = vec.iter().cloned().find(f);
}
{
let vec: Vec<(String, String)> = vec![];
let f = move |x: &(String, String)| x.0.starts_with('2');
let _ = vec.iter().cloned().filter(f);
let _ = vec.iter().cloned().find(f);
}
fn test_move<'a>(
iter: impl Iterator<Item = &'a (&'a u32, String)> + 'a,
target: String,
) -> impl Iterator<Item = (&'a u32, String)> + 'a {
iter.cloned().filter(move |(&a, b)| a == 1 && b == &target)
}
{
#[derive(Clone)]
struct S<'a> {
a: &'a u32,
b: String,
}
fn bar<'a>(iter: impl Iterator<Item = &'a S<'a>> + 'a, target: String) -> impl Iterator<Item = S<'a>> + 'a {
iter.cloned().filter(move |S { a, b }| **a == 1 && b == &target)
}
}
let _ = vec.iter().cloned().map(|x| x.len());
// This would fail if changed.
let _ = vec.iter().cloned().map(|x| x + "2");
let _ = vec.iter().cloned().for_each(|x| assert!(!x.is_empty()));
let _ = vec.iter().cloned().all(|x| x.len() == 1);
let _ = vec.iter().cloned().any(|x| x.len() == 1);
// Should probably stay as it is.
let _ = [0, 1, 2, 3, 4].iter().cloned().take(10);
// `&Range<_>` doesn't implement `IntoIterator`
let _ = [0..1, 2..5].iter().cloned().flatten();
}
// #8527
fn cloned_flatten(x: Option<&Option<String>>) -> Option<String> {
x.cloned().flatten()
}
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