<p>Just filed <a href="https://github.com/rust-lang/rust/issues/130462" target="_blank" rel="nofollow noopener noreferrer" translate="no"><span class="invisible">https://</span><span class="ellipsis">github.com/rust-lang/rust/issu</span><span class="invisible">es/130462</span></a> to get it documented in The Unstable Book</p>