allocator_api 0.4.0

This is a copy of the unstable allocator_api (https://github.com/rust-lang/rust/issues/32838) and of parts of the unstable alloc feature. Usable with stable rust, but requires 1.26.
Documentation 
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#![no_std]
#![cfg_attr(not(feature = "nonnull_cast"), allow(unstable_name_collision))]

#[path = "libcore/alloc.rs"]
mod core_alloc;
#[path = "libstd/alloc.rs"]
mod std_alloc;
#[path = "liballoc/boxed.rs"]
pub mod boxed;
#[path = "liballoc/raw_vec.rs"]
pub mod raw_vec;

pub mod alloc {
    pub use core_alloc::*;
    pub use std_alloc::rust_oom as oom;
    pub use std_alloc::{set_oom_hook, take_oom_hook};
}

pub use alloc::*;
pub use boxed::*;
pub use raw_vec::*;

#[cfg(not(feature = "nonnull_cast"))]
use core::ptr::NonNull;

/// Casting extensions to the `NonNull` type
///
/// This trait adds the [cast] method to the `NonNull` type, which is
/// only available starting from rust 1.27.
///
/// [cast]: https://doc.rust-lang.org/nightly/core/ptr/struct.NonNull.html#method.cast
#[cfg(not(feature = "nonnull_cast"))]
pub trait NonNullCast {
    fn cast<U>(self) -> NonNull<U>;
}

#[cfg(not(feature = "nonnull_cast"))]
impl<T: ?Sized> NonNullCast for NonNull<T> {
    fn cast<U>(self) -> NonNull<U> {
        unsafe {
            NonNull::new_unchecked(self.as_ptr() as *mut U)
        }
    }
}