-// Copyright 2015 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.
-
-#![feature(global_allocator, alloc_system, allocator_api)]
-extern crate alloc_system;
-
+use std::alloc::System;
use std::collections::VecDeque;
-use alloc_system::System;
#[global_allocator]
static ALLOCATOR: System = System;