try_transmute_ref-size-decrease.rs

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// Copyright 2024 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/include.rs");

extern crate zerocopy;

use util::AU16;

use zerocopy::try_transmute_ref;

// Although this is not a soundness requirement, we currently require that the

// size of the destination type is not smaller than the size of the source type.

fn main() {

    let _decrease_size: Result<&u8, _> = try_transmute_ref!(&AU16(0));