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-rw-r--r--src/liballoc/raw_vec.rs3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/liballoc/raw_vec.rs b/src/liballoc/raw_vec.rs
index cbafeae6417..baa64258057 100644
--- a/src/liballoc/raw_vec.rs
+++ b/src/liballoc/raw_vec.rs
@@ -574,7 +574,8 @@ impl<T> RawVec<T, Global> {
     ///
     /// # Safety
     ///
-    /// * `len` must be smaller than or equal to `self.capacity()`
+    /// `shrink_to_fit(len)` must be called immediately prior to calling this function. This
+    /// implies, that `len` must be smaller than or equal to `self.capacity()`.
     pub unsafe fn into_box(self, len: usize) -> Box<[MaybeUninit<T>]> {
         debug_assert!(
             len <= self.capacity(),