title: How to obtain an instance of Rust's new std::heap::System?
body: <p>I am trying to port <a href="https://github.com/rphmeier/allocators" rel="nofollow noreferrer">the allocators crate</a> to the latest toolchain, and it uses the now-removed <code>heap::alloc</code>. Judging by the documentation, I should be using <code>std::heap::System</code> but I don't see how to obtain an instance of it.</p>