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    // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
    // file at the top-level directory of this distribution and at
    // http://rust-lang.org/COPYRIGHT.
    //
    // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
    // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
    // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
    // option. This file may not be copied, modified, or distributed
    // except according to those terms.

    //! # The Rust core allocation library
    //!
    //! This is the lowest level library through which allocation in Rust can be
    //! performed.
    //!
    //! This library, like libcore, is not intended for general usage, but rather as
    //! a building block of other libraries. The types and interfaces in this
    //! library are reexported through the [standard library](../std/index.html),
    //! and should not be used through this library.
    //!
    //! Currently, there are four major definitions in this library.
    //!
    //! ## Boxed values
    //!
    //! The [`Box`](boxed/index.html) 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`](rc/index.html) 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`](arc/index.html) 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>` is itself
    //! sendable while `Rc<T>` is not.
    //!
    //! This types allows for shared access to the contained data, and is often
    //! paired with synchronization primitives such as mutexes to allow mutation of
    //! shared resources.
    //!
    //! ## Heap interfaces
    //!
    //! The [`heap`](heap/index.html) module defines the low-level interface to the
    //! default global allocator. It is not compatible with the libc allocator API.

    #![crate_name = "alloc"]
    #![crate_type = "rlib"]
    #![allow(unused_attributes)]
    #![unstable(feature = "alloc",
                reason = "this library is unlikely to be stabilized in its current \
                          form or name",
                issue = "27783")]
    #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
           html_favicon_url = "../../rust-logo-32x32-blk.png",
           html_root_url = "https://doc.rust-lang.org/nightly/",
           issue_tracker_base_url = "https://github.com/rust-lang/rust/issues/",
           test(no_crate_inject, attr(allow(unused_variables), deny(warnings))))]
    #![no_std]
    #![needs_allocator]

    #![feature(allocator)]
    #![feature(box_syntax)]
    #![feature(coerce_unsized)]
    #![feature(core_intrinsics)]
    #![feature(custom_attribute)]
    #![feature(fundamental)]
    #![feature(lang_items)]
    #![feature(optin_builtin_traits)]
    #![feature(placement_in_syntax)]
    #![feature(placement_new_protocol)]
    #![feature(raw)]
    #![feature(shared)]
    #![feature(staged_api)]
    #![feature(unboxed_closures)]
    #![feature(unique)]
    #![feature(unsafe_no_drop_flag, filling_drop)]
    #![feature(dropck_parametricity)]
    #![feature(unsize)]
    #![feature(drop_in_place)]
    #![feature(fn_traits)]
    #![feature(const_fn)]

    #![feature(needs_allocator)]

    // Issue# 30592: Systematically use alloc_system during stage0 since jemalloc
    // might be unavailable or disabled
    #![cfg_attr(stage0, feature(alloc_system))]

    #![cfg_attr(test, feature(test, rustc_private, box_heap))]

    #[cfg(stage0)]
    extern crate alloc_system;

    // Allow testing this library

    #[cfg(test)]
    #[macro_use]
    extern crate std;
    #[cfg(test)]
    #[macro_use]
    extern crate log;

    // Heaps provided for low-level allocation strategies

    pub mod heap;

    // 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::HEAP;`
    // and `use boxed::Box;` declarations.
    #[cfg(not(test))]
    pub mod boxed;
    #[cfg(test)]
    mod boxed {
        pub use std::boxed::{Box, HEAP};
    }
    #[cfg(test)]
    mod boxed_test;
    pub mod arc;
    pub mod rc;
    pub mod raw_vec;
    pub mod oom;

    pub use oom::oom;

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