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    //! Collection types.

    #![stable(feature = "rust1", since = "1.0.0")]

    pub mod binary_heap;
    mod btree;
    pub mod linked_list;
    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 super::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 super::btree::set::*;
    }

    #[stable(feature = "rust1", since = "1.0.0")]
    #[doc(no_inline)]
    pub use self::binary_heap::BinaryHeap;

    #[stable(feature = "rust1", since = "1.0.0")]
    #[doc(no_inline)]
    pub use self::btree_map::BTreeMap;

    #[stable(feature = "rust1", since = "1.0.0")]
    #[doc(no_inline)]
    pub use self::btree_set::BTreeSet;

    #[stable(feature = "rust1", since = "1.0.0")]
    #[doc(no_inline)]
    pub use self::linked_list::LinkedList;

    #[stable(feature = "rust1", since = "1.0.0")]
    #[doc(no_inline)]
    pub use self::vec_deque::VecDeque;

    use alloc::{AllocErr, LayoutErr};

    /// Augments `AllocErr` with a CapacityOverflow variant.
    #[derive(Clone, PartialEq, Eq, Debug)]
    #[unstable(feature = "try_reserve", reason = "new API", issue="48043")]
    pub enum CollectionAllocErr {
        /// Error due to the computed capacity exceeding the collection's maximum
        /// (usually `isize::MAX` bytes).
        CapacityOverflow,
        /// Error due to the allocator (see the `AllocErr` type's docs).
        AllocErr,
    }

    #[unstable(feature = "try_reserve", reason = "new API", issue="48043")]
    impl From<AllocErr> for CollectionAllocErr {
        #[inline]
        fn from(AllocErr: AllocErr) -> Self {
            CollectionAllocErr::AllocErr
        }
    }

    #[unstable(feature = "try_reserve", reason = "new API", issue="48043")]
    impl From<LayoutErr> for CollectionAllocErr {
        #[inline]
        fn from(_: LayoutErr) -> Self {
            CollectionAllocErr::CapacityOverflow
        }
    }

    /// 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);
    }

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