#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::hash::BuildHasher;
use std::hint;
fn append<H: BuildHasher>(
    hasher: &H,
    v: i32,
    bucket_one: &mut Vec<i32>,
    bucket_two: &mut Vec<i32>,
) {
    let hash = hasher.hash_one(&v);
    let bucket = hint::select_unpredictable(hash % 2 == 0, bucket_one, bucket_two);
    bucket.push(v);
}
fn main() {
    let hasher = std::collections::hash_map::RandomState::new();
    let mut bucket_one = Vec::new();
    let mut bucket_two = Vec::new();
    append(&hasher, 42, &mut bucket_one, &mut bucket_two);
    assert_eq!(bucket_one.len() + bucket_two.len(), 1);
}