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#![allow(warnings)]
#![feature(nll)]
use std::collections::BinaryHeap;
fn main() {
let mut heap: BinaryHeap<i32> = BinaryHeap::new();
let borrow = heap.peek_mut();
match (borrow, ()) {
(Some(_), ()) => {
println!("{:?}", heap); //~ ERROR cannot borrow `heap` as immutable
}
_ => {}
};
}
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