Require Drop impls to have the same constness on its bounds as the bounds on the...

[rust.git] / src / test / ui / issues / issue-17897.rs

// run-pass
fn action(mut cb: Box<dyn FnMut(usize) -> usize>) -> usize {
    cb(1)
}

pub fn main() {
    println!("num: {}", action(Box::new(move |u| u)));
}