From 3e485d7cf59dafbc37467c3ef1acc51f26b381d9 Mon Sep 17 00:00:00 2001
From: Stein Somers <git@steinsomers.be>
Date: Sat, 26 Sep 2020 16:23:50 +0200
Subject: [PATCH] BTreeMap: keep an eye out on the size of the main components

---
 library/alloc/src/collections/btree/node/tests.rs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/library/alloc/src/collections/btree/node/tests.rs b/library/alloc/src/collections/btree/node/tests.rs
index e2416974ddc..54c3709821a 100644
--- a/library/alloc/src/collections/btree/node/tests.rs
+++ b/library/alloc/src/collections/btree/node/tests.rs
@@ -23,3 +23,12 @@ fn test_splitpoint() {
         assert!(left_len + right_len == CAPACITY);
     }
 }
+
+#[test]
+#[cfg(target_arch = "x86_64")]
+fn test_sizes() {
+    assert_eq!(core::mem::size_of::<LeafNode<(), ()>>(), 16);
+    assert_eq!(core::mem::size_of::<LeafNode<i64, i64>>(), 16 + CAPACITY * 8 * 2);
+    assert_eq!(core::mem::size_of::<InternalNode<(), ()>>(), 112);
+    assert_eq!(core::mem::size_of::<InternalNode<i64, i64>>(), 112 + CAPACITY * 8 * 2);
+}