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zerocopy 0.8.19

Zerocopy makes zero-cost memory manipulation effortless. We write "unsafe" so you don't have to.
Documentation 
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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.

// Many of our UI tests require the "derive" feature to function properly. In
// particular:
// - Some tests directly include `zerocopy-derive/tests/include.rs`, which
//   derives traits on the `AU16` type.
// - The file `invalid-impls.rs` directly includes `src/util/macros.rs` in order
//   to test the `impl_or_verify!` macro which is defined in that file.
//   Specifically, it tests the verification portion of that macro, which is
//   enabled when `cfg(any(feature = "derive", test))`. While `--cfg test` is of
//   course passed to the code in the file you're reading right now, `trybuild`
//   does not pass `--cfg test` when it invokes Cargo. As a result, this
//   `trybuild` test only tests the correct behavior when the "derive" feature
//   is enabled.
#![cfg(feature = "derive")]

use testutil::{set_rustflags_w_warnings, ToolchainVersion};

#[test]
#[cfg_attr(miri, ignore)]
fn ui() {
    let version = ToolchainVersion::extract_from_pwd().unwrap();
    // See the doc comment on this method for an explanation of what this does
    // and why we store source files in different directories.
    let source_files_dirname = version.get_ui_source_files_dirname_and_maybe_print_warning();

    // Set `-Wwarnings` in the `RUSTFLAGS` environment variable to ensure that
    // `.stderr` files reflect what the typical user would encounter.
    set_rustflags_w_warnings();

    let t = trybuild::TestCases::new();
    t.compile_fail(format!("tests/{}/*.rs", source_files_dirname));
}

#[test]
#[cfg_attr(miri, ignore)]
fn ui_invalid_impls() {
    let version = ToolchainVersion::extract_from_pwd().unwrap();
    // See the doc comment on this method for an explanation of what this does
    // and why we store source files in different directories.
    let source_files_dirname = version.get_ui_source_files_dirname_and_maybe_print_warning();

    // Set `-Wwarnings` in the `RUSTFLAGS` environment variable to ensure that
    // `.stderr` files reflect what the typical user would encounter.
    set_rustflags_w_warnings();

    let t = trybuild::TestCases::new();
    t.compile_fail(format!("tests/{}/invalid-impls/*.rs", source_files_dirname));
}