From 771a2eb485a6c8e87efe278f15c67bcde051eb21 Mon Sep 17 00:00:00 2001
From: clubby789 <jamie@hill-daniel.co.uk>
Date: Thu, 29 Dec 2022 17:33:04 +0000
Subject: [PATCH] Add codegen test for issue 103840

---
 src/test/codegen/issue-103840.rs | 9 +++++++++
 1 file changed, 9 insertions(+)
 create mode 100644 src/test/codegen/issue-103840.rs

diff --git a/src/test/codegen/issue-103840.rs b/src/test/codegen/issue-103840.rs
new file mode 100644
index 0000000000000..f19d7031bb386
--- /dev/null
+++ b/src/test/codegen/issue-103840.rs
@@ -0,0 +1,9 @@
+// compile-flags: -O
+#![crate_type = "lib"]
+
+pub fn foo(t: &mut Vec<usize>) {
+    // CHECK-NOT: __rust_dealloc
+    let mut taken = std::mem::take(t);
+    taken.pop();
+    *t = taken;
+}