File: issue-47646.rs

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rustc 1.89.0%2Bdfsg1-1
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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
        }
        _ => {}
    };
}