1 files changed, 9 insertions, 0 deletions

diff --git a/tests/codegen/issues/issue-103840.rs b/tests/codegen/issues/issue-103840.rs
new file mode 100644
index 000000000..f19d7031b
--- /dev/null
+++ b/tests/codegen/issues/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;
+}