Use assertions on Vec doc

Clarify what the state of Vec after with_capacity on doc.

1 files changed, 4 insertions, 2 deletions

diff --git a/library/alloc/src/vec.rs b/library/alloc/src/vec.rs
index b4ad238680f..c2b835bcf33 100644
--- a/library/alloc/src/vec.rs
+++ b/library/alloc/src/vec.rs
@@ -116,8 +116,10 @@ use crate::raw_vec::RawVec;
 /// assert_eq!(vec, [0, 0, 0, 0, 0]);
 ///
 /// // The following is equivalent, but potentially slower:
-/// let mut vec1 = Vec::with_capacity(5);
-/// vec1.resize(5, 0);
+/// let mut vec = Vec::with_capacity(5);
+/// assert_eq!(vec, []);
+/// vec.resize(5, 0);
+/// assert_eq!(vec, [0, 0, 0, 0, 0]);
 /// ```
 ///
 /// Use a `Vec<T>` as an efficient stack: