rust/library/core/benches/any.rs

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use core::any::*;
use test::{black_box, Bencher};
#[bench]
fn bench_downcast_ref(b: &mut Bencher) {
b.iter(|| {
let mut x = 0;
let mut y = &mut x as &mut dyn Any;
black_box(&mut y);
black_box(y.downcast_ref::<isize>() == Some(&0));
});
}