--- /dev/null
+// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![feature(duration_as_u128)]
+use std::{collections::VecDeque, time::Instant};
+
+const VECDEQUE_LEN: i32 = 100000;
+const WARMUP_N: usize = 100;
+const BENCH_N: usize = 1000;
+
+fn main() {
+ let a: VecDeque<i32> = (0..VECDEQUE_LEN).collect();
+ let b: VecDeque<i32> = (0..VECDEQUE_LEN).collect();
+
+ for _ in 0..WARMUP_N {
+ let mut c = a.clone();
+ let mut d = b.clone();
+ c.append(&mut d);
+ }
+
+ let mut durations = Vec::with_capacity(BENCH_N);
+
+ for _ in 0..BENCH_N {
+ let mut c = a.clone();
+ let mut d = b.clone();
+ let before = Instant::now();
+ c.append(&mut d);
+ let after = Instant::now();
+ durations.push(after.duration_since(before));
+ }
+
+ let l = durations.len();
+ durations.sort();
+
+ assert!(BENCH_N % 2 == 0);
+ let median = (durations[(l / 2) - 1] + durations[l / 2]) / 2;
+ println!(
+ "\ncustom-bench vec_deque_append {:?} ns/iter\n",
+ median.as_nanos()
+ );
+}