1 files changed, 29 insertions, 0 deletions
diff --git a/src/test/codegen/issue-15953.rs b/src/test/codegen/issue-15953.rs
new file mode 100644
index 000000000..28d284289
--- /dev/null
+++ b/src/test/codegen/issue-15953.rs
@@ -0,0 +1,29 @@
+// Test that llvm generates `memcpy` for moving a value
+// inside a function and moving an argument.
+
+struct Foo {
+    x: Vec<i32>,
+}
+
+#[inline(never)]
+#[no_mangle]
+// CHECK: memcpy
+fn interior(x: Vec<i32>) -> Vec<i32> {
+    let Foo { x } = Foo { x: x };
+    x
+}
+
+#[inline(never)]
+#[no_mangle]
+// CHECK: memcpy
+fn exterior(x: Vec<i32>) -> Vec<i32> {
+    x
+}
+
+fn main() {
+    let x = interior(Vec::new());
+    println!("{:?}", x);
+
+    let x = exterior(Vec::new());
+    println!("{:?}", x);
+}