Merging upstream version 1.76.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 118 insertions, 0 deletions

diff --git a/vendor/zerocopy/src/post_monomorphization_compile_fail_tests.rs b/vendor/zerocopy/src/post_monomorphization_compile_fail_tests.rs
new file mode 100644
index 000000000..32505b669
--- /dev/null
+++ b/vendor/zerocopy/src/post_monomorphization_compile_fail_tests.rs
@@ -0,0 +1,118 @@
+// Copyright 2018 The Fuchsia Authors
+//
+// Licensed under the 2-Clause BSD License <LICENSE-BSD or
+// https://opensource.org/license/bsd-2-clause>, 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.
+
+//! Code that should fail to compile during the post-monomorphization compiler
+//! pass.
+//!
+//! Due to [a limitation with the `trybuild` crate][trybuild-issue], we cannot
+//! use our UI testing framework to test compilation failures that are
+//! encountered after monomorphization has complated. This module has one item
+//! for each such test we would prefer to have as a UI test, with the code in
+//! question appearing as a rustdoc example which is marked with `compile_fail`.
+//! This has the effect of causing doctests to fail if any of these examples
+//! compile successfully.
+//!
+//! This is very much a hack and not a complete replacement for UI tests - most
+//! notably because this only provides a single "compile vs fail" bit of
+//! information, but does not allow us to depend upon the specific error that
+//! causes compilation to fail.
+//!
+//! [trybuild-issue]: https://github.com/dtolnay/trybuild/issues/241
+
+// Miri doesn't detect post-monimorphization failures as compile-time failures,
+// but instead as runtime failures.
+#![cfg(not(miri))]
+
+/// ```compile_fail
+/// use core::cell::{Ref, RefCell};
+///
+/// let refcell = RefCell::new([0u8, 1, 2, 3]);
+/// let core_ref = refcell.borrow();
+/// let core_ref = Ref::map(core_ref, |bytes| &bytes[..]);
+///
+/// // `zc_ref` now stores `core_ref` internally.
+/// let zc_ref = zerocopy::Ref::<_, u32>::new(core_ref).unwrap();
+///
+/// // This causes `core_ref` to get dropped and synthesizes a Rust
+/// // reference to the memory `core_ref` was pointing at.
+/// let rust_ref = zc_ref.into_ref();
+///
+/// // UB!!! This mutates `rust_ref`'s referent while it's alive.
+/// *refcell.borrow_mut() = [0, 0, 0, 0];
+///
+/// println!("{}", rust_ref);
+/// ```
+#[allow(unused)]
+const REFCELL_REF_INTO_REF: () = ();
+
+/// ```compile_fail
+/// use core::cell::{RefCell, RefMut};
+///
+/// let refcell = RefCell::new([0u8, 1, 2, 3]);
+/// let core_ref_mut = refcell.borrow_mut();
+/// let core_ref_mut = RefMut::map(core_ref_mut, |bytes| &mut bytes[..]);
+///
+/// // `zc_ref` now stores `core_ref_mut` internally.
+/// let zc_ref = zerocopy::Ref::<_, u32>::new(core_ref_mut).unwrap();
+///
+/// // This causes `core_ref_mut` to get dropped and synthesizes a Rust
+/// // reference to the memory `core_ref` was pointing at.
+/// let rust_ref_mut = zc_ref.into_mut();
+///
+/// // UB!!! This mutates `rust_ref_mut`'s referent while it's alive.
+/// *refcell.borrow_mut() = [0, 0, 0, 0];
+///
+/// println!("{}", rust_ref_mut);
+/// ```
+#[allow(unused)]
+const REFCELL_REFMUT_INTO_MUT: () = ();
+
+/// ```compile_fail
+/// use core::cell::{Ref, RefCell};
+///
+/// let refcell = RefCell::new([0u8, 1, 2, 3]);
+/// let core_ref = refcell.borrow();
+/// let core_ref = Ref::map(core_ref, |bytes| &bytes[..]);
+///
+/// // `zc_ref` now stores `core_ref` internally.
+/// let zc_ref = zerocopy::Ref::<_, [u16]>::new_slice(core_ref).unwrap();
+///
+/// // This causes `core_ref` to get dropped and synthesizes a Rust
+/// // reference to the memory `core_ref` was pointing at.
+/// let rust_ref = zc_ref.into_slice();
+///
+/// // UB!!! This mutates `rust_ref`'s referent while it's alive.
+/// *refcell.borrow_mut() = [0, 0, 0, 0];
+///
+/// println!("{:?}", rust_ref);
+/// ```
+#[allow(unused)]
+const REFCELL_REFMUT_INTO_SLICE: () = ();
+
+/// ```compile_fail
+/// use core::cell::{RefCell, RefMut};
+///
+/// let refcell = RefCell::new([0u8, 1, 2, 3]);
+/// let core_ref_mut = refcell.borrow_mut();
+/// let core_ref_mut = RefMut::map(core_ref_mut, |bytes| &mut bytes[..]);
+///
+/// // `zc_ref` now stores `core_ref_mut` internally.
+/// let zc_ref = zerocopy::Ref::<_, [u16]>::new_slice(core_ref_mut).unwrap();
+///
+/// // This causes `core_ref_mut` to get dropped and synthesizes a Rust
+/// // reference to the memory `core_ref` was pointing at.
+/// let rust_ref_mut = zc_ref.into_mut_slice();
+///
+/// // UB!!! This mutates `rust_ref_mut`'s referent while it's alive.
+/// *refcell.borrow_mut() = [0, 0, 0, 0];
+///
+/// println!("{:?}", rust_ref_mut);
+/// ```
+#[allow(unused)]
+const REFCELL_REFMUT_INTO_MUT_SLICE: () = ();