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    // Copyright 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.

    //! dox

    #![unstable(issue = "32838", feature = "allocator_api")]

    #[doc(inline)] #[allow(deprecated)] pub use alloc_crate::alloc::Heap;
    #[doc(inline)] pub use alloc_crate::alloc::{Global, oom};
    #[doc(inline)] pub use alloc_system::System;
    #[doc(inline)] pub use core::alloc::*;

    #[cfg(not(stage0))]
    #[cfg(not(test))]
    #[doc(hidden)]
    #[lang = "oom"]
    pub extern fn rust_oom() -> ! {
        rtabort!("memory allocation failed");
    }

    #[cfg(not(test))]
    #[doc(hidden)]
    #[allow(unused_attributes)]
    pub mod __default_lib_allocator {
        use super::{System, Layout, GlobalAlloc, Opaque};
        // for symbol names src/librustc/middle/allocator.rs
        // for signatures src/librustc_allocator/lib.rs

        // linkage directives are provided as part of the current compiler allocator
        // ABI

        #[no_mangle]
        #[rustc_std_internal_symbol]
        pub unsafe extern fn __rdl_alloc(size: usize, align: usize) -> *mut u8 {
            let layout = Layout::from_size_align_unchecked(size, align);
            System.alloc(layout) as *mut u8
        }

        #[cfg(stage0)]
        #[no_mangle]
        #[rustc_std_internal_symbol]
        pub unsafe extern fn __rdl_oom() -> ! {
            super::oom()
        }

        #[no_mangle]
        #[rustc_std_internal_symbol]
        pub unsafe extern fn __rdl_dealloc(ptr: *mut u8,
                                           size: usize,
                                           align: usize) {
            System.dealloc(ptr as *mut Opaque, Layout::from_size_align_unchecked(size, align))
        }

        #[no_mangle]
        #[rustc_std_internal_symbol]
        pub unsafe extern fn __rdl_realloc(ptr: *mut u8,
                                           old_size: usize,
                                           align: usize,
                                           new_size: usize) -> *mut u8 {
            let old_layout = Layout::from_size_align_unchecked(old_size, align);
            System.realloc(ptr as *mut Opaque, old_layout, new_size) as *mut u8
        }

        #[no_mangle]
        #[rustc_std_internal_symbol]
        pub unsafe extern fn __rdl_alloc_zeroed(size: usize, align: usize) -> *mut u8 {
            let layout = Layout::from_size_align_unchecked(size, align);
            System.alloc_zeroed(layout) as *mut u8
        }

        #[cfg(stage0)]
        pub mod stage0 {
            #[no_mangle]
            #[rustc_std_internal_symbol]
            pub unsafe extern fn __rdl_usable_size(_layout: *const u8,
                                                   _min: *mut usize,
                                                   _max: *mut usize) {
                unimplemented!()
            }

            #[no_mangle]
            #[rustc_std_internal_symbol]
            pub unsafe extern fn __rdl_alloc_excess(_size: usize,
                                                    _align: usize,
                                                    _excess: *mut usize,
                                                    _err: *mut u8) -> *mut u8 {
                unimplemented!()
            }

            #[no_mangle]
            #[rustc_std_internal_symbol]
            pub unsafe extern fn __rdl_realloc_excess(_ptr: *mut u8,
                                                      _old_size: usize,
                                                      _old_align: usize,
                                                      _new_size: usize,
                                                      _new_align: usize,
                                                      _excess: *mut usize,
                                                      _err: *mut u8) -> *mut u8 {
                unimplemented!()
            }

            #[no_mangle]
            #[rustc_std_internal_symbol]
            pub unsafe extern fn __rdl_grow_in_place(_ptr: *mut u8,
                                                     _old_size: usize,
                                                     _old_align: usize,
                                                     _new_size: usize,
                                                     _new_align: usize) -> u8 {
                unimplemented!()
            }

            #[no_mangle]
            #[rustc_std_internal_symbol]
            pub unsafe extern fn __rdl_shrink_in_place(_ptr: *mut u8,
                                                       _old_size: usize,
                                                       _old_align: usize,
                                                       _new_size: usize,
                                                       _new_align: usize) -> u8 {
                unimplemented!()
            }

        }
    }

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