1 files changed, 19 insertions, 0 deletions
diff --git a/third_party/rust/zerocopy/tests/ui-nightly/transmute-size-increase.rs b/third_party/rust/zerocopy/tests/ui-nightly/transmute-size-increase.rs
new file mode 100644
index 0000000000..32f9363089
--- /dev/null
+++ b/third_party/rust/zerocopy/tests/ui-nightly/transmute-size-increase.rs
@@ -0,0 +1,19 @@
+// Copyright 2023 The Fuchsia Authors
+//
+// Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0
+// <LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0>, or the MIT
+// license <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your option.
+// This file may not be copied, modified, or distributed except according to
+// those terms.
+
+include!("../../zerocopy-derive/tests/util.rs");
+
+extern crate zerocopy;
+
+use zerocopy::transmute;
+
+fn main() {}
+
+// `transmute!` does not support transmuting from a smaller type to a larger
+// one.
+const INCREASE_SIZE: AU16 = transmute!(0u8);