alloc::boxed::HEAPUnstable

pub static HEAP: () = ();

A value that represents the heap. This is the default place that the box keyword allocates into when no place is supplied.

The following two examples are equivalent:

#![feature(box_syntax)]
use std::boxed::HEAP;

fn main() {
    let foo = box(HEAP) 5;
    let foo = box 5;
}