From c89b6a955c9e16c7c96714cea7945945caadcc79 Mon Sep 17 00:00:00 2001
From: Marijn Schouten <mhkbst@gmail.com>
Date: Wed, 10 Sep 2025 12:40:29 +0000
Subject: [PATCH] Iterator repeat: no infinite loop for `last` and `count`

---
 library/core/src/iter/sources/repeat.rs | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/library/core/src/iter/sources/repeat.rs b/library/core/src/iter/sources/repeat.rs
index c4f5a483e5c2a..4bcd5b16aea6a 100644
--- a/library/core/src/iter/sources/repeat.rs
+++ b/library/core/src/iter/sources/repeat.rs
@@ -9,7 +9,7 @@ use crate::num::NonZero;
 /// [`Iterator::take()`], in order to make them finite.
 ///
 /// Use [`str::repeat()`] instead of this function if you just want to repeat
-/// a char/string `n`th times.
+/// a char/string `n` times.
 ///
 /// If the element type of the iterator you need does not implement `Clone`,
 /// or if you do not want to keep the repeated element in memory, you can
@@ -98,11 +98,12 @@ impl<A: Clone> Iterator for Repeat<A> {
     }
 
     fn last(self) -> Option<A> {
-        loop {}
+        Some(self.element)
     }
 
+    #[track_caller]
     fn count(self) -> usize {
-        loop {}
+        panic!("iterator is infinite");
     }
 }