From e8fd17b86d426ab3aa12b667f23ad7eb0da81a28 Mon Sep 17 00:00:00 2001
From: Philippe-Cholet <phcholet@orange.fr>
Date: Mon, 30 Oct 2023 11:59:38 +0100
Subject: [PATCH] Benchmark `nth_back` specializations too

Similar to `nth` benchmark.

With this, all iterator method specializations are considered except for methods that rely on `[r]fold/try_[r]fold` by default.
We might want to add others later.
---
 benches/specializations.rs | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/benches/specializations.rs b/benches/specializations.rs
index b98b7e5eb..139270897 100644
--- a/benches/specializations.rs
+++ b/benches/specializations.rs
@@ -100,6 +100,19 @@ macro_rules! bench_specializations {
                 black_box(x);
             }
         }));
+        $group.bench_function("nth_back", |bencher| bencher.iter(|| {
+            for start in 0_usize..10 {
+                for n in 0..10 {
+                    let mut it = $iterator;
+                    if let Some(s) = start.checked_sub(1) {
+                        black_box(it.nth_back(s));
+                    }
+                    while let Some(x) = it.nth_back(n) {
+                        black_box(x);
+                    }
+                }
+            }
+        }));
         $group.bench_function("rfold", |bencher| bencher.iter(|| {
             $iterator.rfold((), |(), x| {
                 black_box(x);