Update new usage of `assert_len`

diff --git a/library/alloc/src/vec/mod.rs b/library/alloc/src/vec/mod.rs
index a8474f8ca5921305bd5762ca29282ce56d7891af..77302d33bc187d5f88c1aa9355198379e55c1b50 100644 (file)
--- a/library/alloc/src/vec/mod.rs
+++ b/library/alloc/src/vec/mod.rs
@@ -2036,11 +2036,11 @@ pub fn extend_from_within<R>(&mut self, src: R)
     where
         R: RangeBounds<usize>,
     {
-        let range = src.assert_len(self.len());
+        let range = slice::range(src, ..self.len());
         self.reserve(range.len());
 
         // SAFETY:
-        // - `assert_len` guarantees  that the given range is valid for indexing self
+        // - `slice::range` guarantees  that the given range is valid for indexing self
         unsafe {
             self.spec_extend_from_within(range);
         }