diff --git a/rust-toolchain b/rust-toolchain
index 48282503c507..c1bf4c3de804 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-nightly-2018-09-18
+nightly-2018-09-22
diff --git a/tests/run-pass/issue-53728.rs b/tests/run-pass/issue-53728.rs
new file mode 100644
index 000000000000..6d440b66b35a
--- /dev/null
+++ b/tests/run-pass/issue-53728.rs
@@ -0,0 +1,16 @@
+#![allow(dead_code)]
+
+#[repr(u16)]
+enum DeviceKind {
+    Nil = 0,
+}
+#[repr(packed)]
+struct DeviceInfo {
+    endianness: u8,
+    device_kind: DeviceKind,
+}
+fn main() {
+    let _x = None::<(DeviceInfo, u8)>;
+    let _y = None::<(DeviceInfo, u16)>;
+    let _z = None::<(DeviceInfo, u64)>;
+}
diff --git a/tests/run-pass/static_memory_modification.rs b/tests/run-pass/static_memory_modification.rs
index a68f727322e2..6a4107817798 100644
--- a/tests/run-pass/static_memory_modification.rs
+++ b/tests/run-pass/static_memory_modification.rs
@@ -1,8 +1,14 @@
+use std::sync::atomic::{Ordering, AtomicUsize};
+
 static mut X: usize = 5;
+static Y: AtomicUsize = AtomicUsize::new(5);
 
 fn main() {
     unsafe {
         X = 6;
         assert_eq!(X, 6);
     }
+
+    Y.store(6, Ordering::Relaxed);
+    assert_eq!(Y.load(Ordering::Relaxed), 6);
 }