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-// SPDX-License-Identifier: Apache-2.0 OR MIT
-
-//! # The Rust core allocation and collections library
-//!
-//! This library provides smart pointers and collections for managing
-//! heap-allocated values.
-//!
-//! This library, like core, normally doesn’t need to be used directly
-//! since its contents are re-exported in the [`std` crate](../std/index.html).
-//! Crates that use the `#![no_std]` attribute however will typically
-//! not depend on `std`, so they’d use this crate instead.
-//!
-//! ## Boxed values
-//!
-//! The [`Box`] type is a smart pointer type. There can only be one owner of a
-//! [`Box`], and the owner can decide to mutate the contents, which live on the
-//! heap.
-//!
-//! This type can be sent among threads efficiently as the size of a `Box` value
-//! is the same as that of a pointer. Tree-like data structures are often built
-//! with boxes because each node often has only one owner, the parent.
-//!
-//! ## Reference counted pointers
-//!
-//! The [`Rc`] type is a non-threadsafe reference-counted pointer type intended
-//! for sharing memory within a thread. An [`Rc`] pointer wraps a type, `T`, and
-//! only allows access to `&T`, a shared reference.
-//!
-//! This type is useful when inherited mutability (such as using [`Box`]) is too
-//! constraining for an application, and is often paired with the [`Cell`] or
-//! [`RefCell`] types in order to allow mutation.
-//!
-//! ## Atomically reference counted pointers
-//!
-//! The [`Arc`] type is the threadsafe equivalent of the [`Rc`] type. It
-//! provides all the same functionality of [`Rc`], except it requires that the
-//! contained type `T` is shareable. Additionally, [`Arc<T>`][`Arc`] is itself
-//! sendable while [`Rc<T>`][`Rc`] is not.
-//!
-//! This type allows for shared access to the contained data, and is often
-//! paired with synchronization primitives such as mutexes to allow mutation of
-//! shared resources.
-//!
-//! ## Collections
-//!
-//! Implementations of the most common general purpose data structures are
-//! defined in this library. They are re-exported through the
-//! [standard collections library](../std/collections/index.html).
-//!
-//! ## Heap interfaces
-//!
-//! The [`alloc`](alloc/index.html) module defines the low-level interface to the
-//! default global allocator. It is not compatible with the libc allocator API.
-//!
-//! [`Arc`]: sync
-//! [`Box`]: boxed
-//! [`Cell`]: core::cell
-//! [`Rc`]: rc
-//! [`RefCell`]: core::cell
-
-// To run alloc tests without x.py without ending up with two copies of alloc, Miri needs to be
-// able to "empty" this crate. See <https://github.com/rust-lang/miri-test-libstd/issues/4>.
-// rustc itself never sets the feature, so this line has no effect there.
-#![cfg(any(not(feature = "miri-test-libstd"), test, doctest))]
-//
-#![allow(unused_attributes)]
-#![stable(feature = "alloc", since = "1.36.0")]
-#![doc(
- html_playground_url = "https://play.rust-lang.org/",
- issue_tracker_base_url = "https://github.com/rust-lang/rust/issues/",
- test(no_crate_inject, attr(allow(unused_variables), deny(warnings)))
-)]
-#![doc(cfg_hide(
- not(test),
- not(any(test, bootstrap)),
- any(not(feature = "miri-test-libstd"), test, doctest),
- no_global_oom_handling,
- not(no_global_oom_handling),
- not(no_rc),
- not(no_sync),
- target_has_atomic = "ptr"
-))]
-#![doc(rust_logo)]
-#![feature(rustdoc_internals)]
-#![no_std]
-#![needs_allocator]
-// Lints:
-#![deny(unsafe_op_in_unsafe_fn)]
-#![deny(fuzzy_provenance_casts)]
-#![warn(deprecated_in_future)]
-#![warn(missing_debug_implementations)]
-#![warn(missing_docs)]
-#![allow(explicit_outlives_requirements)]
-#![warn(multiple_supertrait_upcastable)]
-#![allow(internal_features)]
-#![allow(rustdoc::redundant_explicit_links)]
-//
-// Library features:
-// tidy-alphabetical-start
-#![cfg_attr(not(no_global_oom_handling), feature(const_alloc_error))]
-#![cfg_attr(not(no_global_oom_handling), feature(const_btree_len))]
-#![cfg_attr(test, feature(is_sorted))]
-#![cfg_attr(test, feature(new_uninit))]
-#![feature(alloc_layout_extra)]
-#![feature(allocator_api)]
-#![feature(array_chunks)]
-#![feature(array_into_iter_constructors)]
-#![feature(array_methods)]
-#![feature(array_windows)]
-#![feature(ascii_char)]
-#![feature(assert_matches)]
-#![feature(async_iterator)]
-#![feature(coerce_unsized)]
-#![feature(const_align_of_val)]
-#![feature(const_box)]
-#![cfg_attr(not(no_borrow), feature(const_cow_is_borrowed))]
-#![feature(const_eval_select)]
-#![feature(const_maybe_uninit_as_mut_ptr)]
-#![feature(const_maybe_uninit_write)]
-#![feature(const_pin)]
-#![feature(const_refs_to_cell)]
-#![feature(const_size_of_val)]
-#![feature(const_waker)]
-#![feature(core_intrinsics)]
-#![feature(core_panic)]
-#![feature(deprecated_suggestion)]
-#![feature(dispatch_from_dyn)]
-#![feature(error_generic_member_access)]
-#![feature(error_in_core)]
-#![feature(exact_size_is_empty)]
-#![feature(extend_one)]
-#![feature(fmt_internals)]
-#![feature(fn_traits)]
-#![feature(hasher_prefixfree_extras)]
-#![feature(inline_const)]
-#![feature(inplace_iteration)]
-#![feature(iter_advance_by)]
-#![feature(iter_next_chunk)]
-#![feature(iter_repeat_n)]
-#![feature(layout_for_ptr)]
-#![feature(maybe_uninit_slice)]
-#![feature(maybe_uninit_uninit_array)]
-#![feature(maybe_uninit_uninit_array_transpose)]
-#![feature(pattern)]
-#![feature(ptr_internals)]
-#![feature(ptr_metadata)]
-#![feature(ptr_sub_ptr)]
-#![feature(receiver_trait)]
-#![feature(set_ptr_value)]
-#![feature(sized_type_properties)]
-#![feature(slice_from_ptr_range)]
-#![feature(slice_group_by)]
-#![feature(slice_ptr_get)]
-#![feature(slice_ptr_len)]
-#![feature(slice_range)]
-#![feature(std_internals)]
-#![feature(str_internals)]
-#![feature(strict_provenance)]
-#![feature(trusted_fused)]
-#![feature(trusted_len)]
-#![feature(trusted_random_access)]
-#![feature(try_trait_v2)]
-#![feature(tuple_trait)]
-#![feature(unchecked_math)]
-#![feature(unicode_internals)]
-#![feature(unsize)]
-#![feature(utf8_chunks)]
-// tidy-alphabetical-end
-//
-// Language features:
-// tidy-alphabetical-start
-#![cfg_attr(not(test), feature(coroutine_trait))]
-#![cfg_attr(test, feature(panic_update_hook))]
-#![cfg_attr(test, feature(test))]
-#![feature(allocator_internals)]
-#![feature(allow_internal_unstable)]
-#![feature(associated_type_bounds)]
-#![feature(c_unwind)]
-#![feature(cfg_sanitize)]
-#![feature(const_mut_refs)]
-#![feature(const_precise_live_drops)]
-#![feature(const_ptr_write)]
-#![feature(const_trait_impl)]
-#![feature(const_try)]
-#![feature(dropck_eyepatch)]
-#![feature(exclusive_range_pattern)]
-#![feature(fundamental)]
-#![feature(hashmap_internals)]
-#![feature(lang_items)]
-#![feature(min_specialization)]
-#![feature(multiple_supertrait_upcastable)]
-#![feature(negative_impls)]
-#![feature(never_type)]
-#![feature(pointer_is_aligned)]
-#![feature(rustc_allow_const_fn_unstable)]
-#![feature(rustc_attrs)]
-#![feature(slice_internals)]
-#![feature(staged_api)]
-#![feature(stmt_expr_attributes)]
-#![feature(unboxed_closures)]
-#![feature(unsized_fn_params)]
-#![feature(with_negative_coherence)]
-// tidy-alphabetical-end
-//
-// Rustdoc features:
-#![feature(doc_cfg)]
-#![feature(doc_cfg_hide)]
-// Technically, this is a bug in rustdoc: rustdoc sees the documentation on `#[lang = slice_alloc]`
-// blocks is for `&[T]`, which also has documentation using this feature in `core`, and gets mad
-// that the feature-gate isn't enabled. Ideally, it wouldn't check for the feature gate for docs
-// from other crates, but since this can only appear for lang items, it doesn't seem worth fixing.
-#![feature(intra_doc_pointers)]
-
-// Allow testing this library
-#[cfg(test)]
-#[macro_use]
-extern crate std;
-#[cfg(test)]
-extern crate test;
-#[cfg(test)]
-mod testing;
-
-// Module with internal macros used by other modules (needs to be included before other modules).
-#[cfg(not(no_macros))]
-#[macro_use]
-mod macros;
-
-mod raw_vec;
-
-// Heaps provided for low-level allocation strategies
-
-pub mod alloc;
-
-// Primitive types using the heaps above
-
-// Need to conditionally define the mod from `boxed.rs` to avoid
-// duplicating the lang-items when building in test cfg; but also need
-// to allow code to have `use boxed::Box;` declarations.
-#[cfg(not(test))]
-pub mod boxed;
-#[cfg(test)]
-mod boxed {
- pub use std::boxed::Box;
-}
-#[cfg(not(no_borrow))]
-pub mod borrow;
-pub mod collections;
-#[cfg(all(not(no_rc), not(no_sync), not(no_global_oom_handling)))]
-pub mod ffi;
-#[cfg(not(no_fmt))]
-pub mod fmt;
-#[cfg(not(no_rc))]
-pub mod rc;
-pub mod slice;
-#[cfg(not(no_str))]
-pub mod str;
-#[cfg(not(no_string))]
-pub mod string;
-#[cfg(all(not(no_rc), not(no_sync), target_has_atomic = "ptr"))]
-pub mod sync;
-#[cfg(all(not(no_global_oom_handling), not(no_rc), not(no_sync), target_has_atomic = "ptr"))]
-pub mod task;
-#[cfg(test)]
-mod tests;
-pub mod vec;
-
-#[doc(hidden)]
-#[unstable(feature = "liballoc_internals", issue = "none", reason = "implementation detail")]
-pub mod __export {
- pub use core::format_args;
-}
-
-#[cfg(test)]
-#[allow(dead_code)] // Not used in all configurations
-pub(crate) mod test_helpers {
- /// Copied from `std::test_helpers::test_rng`, since these tests rely on the
- /// seed not being the same for every RNG invocation too.
- pub(crate) fn test_rng() -> rand_xorshift::XorShiftRng {
- use std::hash::{BuildHasher, Hash, Hasher};
- let mut hasher = std::hash::RandomState::new().build_hasher();
- std::panic::Location::caller().hash(&mut hasher);
- let hc64 = hasher.finish();
- let seed_vec =
- hc64.to_le_bytes().into_iter().chain(0u8..8).collect::<crate::vec::Vec<u8>>();
- let seed: [u8; 16] = seed_vec.as_slice().try_into().unwrap();
- rand::SeedableRng::from_seed(seed)
- }
-}