Constant std::boxed::HEAP

pub const HEAP: ExchangeHeapSingleton = ExchangeHeapSingleton{_force_singleton: (),}

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_heap)]

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

fn main() {
    let foo: Box<i32> = in HEAP { 5 };
    let foo = box 5;
}