From 577ca75d6f81e4555dcd02055b9ff6d208e08024 Mon Sep 17 00:00:00 2001
From: Will Crozier <willcrozi@gmail.com>
Date: Sun, 13 Sep 2020 15:40:29 +0100
Subject: [PATCH] Powerset: use saturating add for position

---
 src/powerset.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/powerset.rs b/src/powerset.rs
index 407c74dfd..914a0e5e0 100644
--- a/src/powerset.rs
+++ b/src/powerset.rs
@@ -51,7 +51,7 @@ impl<I> Iterator for Powerset<I>
 
     fn next(&mut self) -> Option<Vec<I::Item>> {
         if let Some(elt) = self.combs.next() {
-            self.pos += 1;
+            self.pos = self.pos.saturating_add(1);
             Some(elt)
         } else {
             if self.done {
@@ -59,7 +59,7 @@ impl<I> Iterator for Powerset<I>
             } else {
                 self.combs.init(self.combs.k() + 1);
                 if let Some(elt) = self.combs.next() {
-                    self.pos += 1;
+                    self.pos = self.pos.saturating_add(1);
                     Some(elt)
                 } else {
                     // None returned from a new Combinations indicates we're finished.