From 2e00214b3efbdfeefaa0fe9e8b8fd519de7adc35 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:19:50 +0200
Subject: Merging upstream version 1.69.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 library/core/src/iter/adapters/map.rs | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

(limited to 'library/core/src/iter/adapters/map.rs')

diff --git a/library/core/src/iter/adapters/map.rs b/library/core/src/iter/adapters/map.rs
index 9e25dbe46..31d02a4da 100644
--- a/library/core/src/iter/adapters/map.rs
+++ b/library/core/src/iter/adapters/map.rs
@@ -2,7 +2,7 @@ use crate::fmt;
 use crate::iter::adapters::{
     zip::try_get_unchecked, SourceIter, TrustedRandomAccess, TrustedRandomAccessNoCoerce,
 };
-use crate::iter::{FusedIterator, InPlaceIterable, TrustedLen};
+use crate::iter::{FusedIterator, InPlaceIterable, TrustedLen, UncheckedIterator};
 use crate::ops::Try;
 
 /// An iterator that maps the values of `iter` with `f`.
@@ -187,6 +187,19 @@ where
 {
 }
 
+impl<B, I, F> UncheckedIterator for Map<I, F>
+where
+    I: UncheckedIterator,
+    F: FnMut(I::Item) -> B,
+{
+    unsafe fn next_unchecked(&mut self) -> B {
+        // SAFETY: `Map` is 1:1 with the inner iterator, so if the caller promised
+        // that there's an element left, the inner iterator has one too.
+        let item = unsafe { self.iter.next_unchecked() };
+        (self.f)(item)
+    }
+}
+
 #[doc(hidden)]
 #[unstable(feature = "trusted_random_access", issue = "none")]
 unsafe impl<I, F> TrustedRandomAccess for Map<I, F> where I: TrustedRandomAccess {}
-- 
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