1 files changed, 17 insertions, 0 deletions
diff --git a/tests/codegen/mir_zst_stores.rs b/tests/codegen/mir_zst_stores.rs
new file mode 100644
index 000000000..17e7ba309
--- /dev/null
+++ b/tests/codegen/mir_zst_stores.rs
@@ -0,0 +1,17 @@
+// compile-flags: -C no-prepopulate-passes
+
+#![crate_type = "lib"]
+use std::marker::PhantomData;
+
+#[derive(Copy, Clone)]
+struct Zst { phantom: PhantomData<Zst> }
+
+// CHECK-LABEL: @mir
+// CHECK-NOT: store{{.*}}undef
+#[no_mangle]
+pub fn mir() {
+    let x = Zst { phantom: PhantomData };
+    let y = (x, 0);
+    drop(y);
+    drop((0, x));
+}