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// edition:2021
//check-pass
#![warn(unused)]
#![feature(rustc_attrs)]
#![feature(btree_extract_if)]
use std::collections::BTreeMap;
use std::panic::{catch_unwind, AssertUnwindSafe};
fn main() {
let mut map = BTreeMap::new();
map.insert("a", ());
map.insert("b", ());
map.insert("c", ());
{
let mut it = map.extract_if(|_, _| true);
catch_unwind(AssertUnwindSafe(|| while it.next().is_some() {})).unwrap_err();
let result = catch_unwind(AssertUnwindSafe(|| it.next()));
assert!(matches!(result, Ok(None)));
}
{
let mut it = map.extract_if(|_, _| true);
catch_unwind(AssertUnwindSafe(|| while let Some(_) = it.next() {})).unwrap_err();
let result = catch_unwind(AssertUnwindSafe(|| it.next()));
assert!(matches!(result, Ok(None)));
}
}
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