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    // Copyright 2014-2017 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 and collections library
    //!
    //! This library provides smart pointers and collections for managing
    //! heap-allocated values.
    //!
    //! 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.
    //!
    //! ## 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 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 reexported through the
    //! [standard collections library](../std/collections/index.html).
    //!
    //! ## 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 = "https://doc.rust-lang.org/favicon.ico",
           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]
    #![deny(warnings)]
    #![deny(missing_debug_implementations)]

    #![cfg_attr(test, allow(deprecated))] // rand
    #![cfg_attr(test, feature(placement_in))]
    #![cfg_attr(not(test), feature(char_escape_debug))]
    #![cfg_attr(not(test), feature(core_float))]
    #![cfg_attr(not(test), feature(exact_size_is_empty))]
    #![cfg_attr(not(test), feature(slice_rotate))]
    #![cfg_attr(not(test), feature(str_checked_slicing))]
    #![cfg_attr(test, feature(rand, test))]
    #![cfg_attr(stage0, feature(allocator))]
    #![feature(allow_internal_unstable)]
    #![feature(box_patterns)]
    #![feature(box_syntax)]
    #![feature(cfg_target_has_atomic)]
    #![feature(coerce_unsized)]
    #![feature(const_fn)]
    #![feature(core_intrinsics)]
    #![feature(custom_attribute)]
    #![feature(dropck_eyepatch)]
    #![feature(exact_size_is_empty)]
    #![feature(fmt_internals)]
    #![feature(fundamental)]
    #![feature(fused)]
    #![feature(generic_param_attrs)]
    #![feature(i128_type)]
    #![feature(inclusive_range)]
    #![feature(lang_items)]
    #![feature(manually_drop)]
    #![feature(needs_allocator)]
    #![feature(nonzero)]
    #![feature(offset_to)]
    #![feature(optin_builtin_traits)]
    #![feature(pattern)]
    #![feature(placement_in_syntax)]
    #![feature(placement_new_protocol)]
    #![feature(shared)]
    #![feature(slice_get_slice)]
    #![feature(slice_patterns)]
    #![feature(slice_rsplit)]
    #![feature(specialization)]
    #![feature(staged_api)]
    #![feature(str_internals)]
    #![feature(str_mut_extras)]
    #![feature(trusted_len)]
    #![feature(unboxed_closures)]
    #![feature(unicode)]
    #![feature(unique)]
    #![feature(unsize)]
    #![cfg_attr(not(stage0), feature(allocator_internals))]

    #![cfg_attr(not(test), feature(fused, fn_traits, placement_new_protocol))]
    #![cfg_attr(test, feature(test, box_heap))]

    // Allow testing this library

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

    extern crate std_unicode;

    // Module with internal macros used by other modules (needs to be included before other modules).
    #[macro_use]
    mod macros;

    // Allocator trait and helper struct definitions

    pub mod allocator;

    // 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, IntermediateBox, HEAP};
    }
    #[cfg(test)]
    mod boxed_test;
    #[cfg(target_has_atomic = "ptr")]
    pub mod arc;
    pub mod rc;
    pub mod raw_vec;

    // collections modules
    pub mod binary_heap;
    mod btree;
    pub mod borrow;
    pub mod fmt;
    pub mod linked_list;
    pub mod range;
    pub mod slice;
    pub mod str;
    pub mod string;
    pub mod vec;
    pub mod vec_deque;

    #[stable(feature = "rust1", since = "1.0.0")]
    pub mod btree_map {
        //! A map based on a B-Tree.
        #[stable(feature = "rust1", since = "1.0.0")]
        pub use btree::map::*;
    }

    #[stable(feature = "rust1", since = "1.0.0")]
    pub mod btree_set {
        //! A set based on a B-Tree.
        #[stable(feature = "rust1", since = "1.0.0")]
        pub use btree::set::*;
    }

    #[cfg(not(test))]
    mod std {
        pub use core::ops;      // RangeFull
    }

    /// An endpoint of a range of keys.
    ///
    /// # Examples
    ///
    /// `Bound`s are range endpoints:
    ///
    /// ```
    /// #![feature(collections_range)]
    ///
    /// use std::collections::range::RangeArgument;
    /// use std::collections::Bound::*;
    ///
    /// assert_eq!((..100).start(), Unbounded);
    /// assert_eq!((1..12).start(), Included(&1));
    /// assert_eq!((1..12).end(), Excluded(&12));
    /// ```
    ///
    /// Using a tuple of `Bound`s as an argument to [`BTreeMap::range`].
    /// Note that in most cases, it's better to use range syntax (`1..5`) instead.
    ///
    /// ```
    /// use std::collections::BTreeMap;
    /// use std::collections::Bound::{Excluded, Included, Unbounded};
    ///
    /// let mut map = BTreeMap::new();
    /// map.insert(3, "a");
    /// map.insert(5, "b");
    /// map.insert(8, "c");
    ///
    /// for (key, value) in map.range((Excluded(3), Included(8))) {
    ///     println!("{}: {}", key, value);
    /// }
    ///
    /// assert_eq!(Some((&3, &"a")), map.range((Unbounded, Included(5))).next());
    /// ```
    ///
    /// [`BTreeMap::range`]: btree_map/struct.BTreeMap.html#method.range
    #[stable(feature = "collections_bound", since = "1.17.0")]
    #[derive(Clone, Copy, Debug, Hash, PartialEq, Eq)]
    pub enum Bound<T> {
        /// An inclusive bound.
        #[stable(feature = "collections_bound", since = "1.17.0")]
        Included(T),
        /// An exclusive bound.
        #[stable(feature = "collections_bound", since = "1.17.0")]
        Excluded(T),
        /// An infinite endpoint. Indicates that there is no bound in this direction.
        #[stable(feature = "collections_bound", since = "1.17.0")]
        Unbounded,
    }

    /// An intermediate trait for specialization of `Extend`.
    #[doc(hidden)]
    trait SpecExtend<I: IntoIterator> {
        /// Extends `self` with the contents of the given iterator.
        fn spec_extend(&mut self, iter: I);
    }

    #[doc(no_inline)]
    pub use binary_heap::BinaryHeap;
    #[doc(no_inline)]
    pub use btree_map::BTreeMap;
    #[doc(no_inline)]
    pub use btree_set::BTreeSet;
    #[doc(no_inline)]
    pub use linked_list::LinkedList;
    #[doc(no_inline)]
    pub use vec_deque::VecDeque;
    #[doc(no_inline)]
    pub use string::String;
    #[doc(no_inline)]
    pub use vec::Vec;

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