1 files changed, 9 insertions, 0 deletions
diff --git a/library/alloc/src/raw_vec/tests.rs b/library/alloc/src/raw_vec/tests.rs
index ff322f0da97..f8cada01c03 100644
--- a/library/alloc/src/raw_vec/tests.rs
+++ b/library/alloc/src/raw_vec/tests.rs
@@ -1,4 +1,5 @@
 use super::*;
+use core::mem::size_of;
 use std::cell::Cell;
 
 #[test]
@@ -161,3 +162,11 @@ fn zst_reserve_exact_panic() {
 
     v.reserve_exact(101, usize::MAX - 100);
 }
+
+#[test]
+fn niches() {
+    let baseline = size_of::<RawVec<u8>>();
+    assert_eq!(size_of::<Option<RawVec<u8>>>(), baseline);
+    assert_eq!(size_of::<Option<Option<RawVec<u8>>>>(), baseline);
+    assert_eq!(size_of::<Option<Option<Option<RawVec<u8>>>>>(), baseline);
+}