Vendor things

third-party/vendor/zerocopy-derive/tests/priv_in_pub.rs

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+// Copyright 2019 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.
+
+use zerocopy::{AsBytes, FromBytes, FromZeroes, KnownLayout, Unaligned};
+
+// These derives do not result in E0446 as of Rust 1.59.0, because of
+// https://github.com/rust-lang/rust/pull/90586.
+//
+// This change eliminates one of the major downsides of emitting `where`
+// bounds for field types (i.e., the emission of E0446 for private field
+// types).
+
+#[derive(KnownLayout, AsBytes, FromZeroes, FromBytes, Unaligned)]
+#[repr(C)]
+pub struct Public(Private);
+
+#[derive(KnownLayout, AsBytes, FromZeroes, FromBytes, Unaligned)]
+#[repr(C)]
+struct Private(());