#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
#![feature(if_let_guard)]
-#![feature(let_else)]
+#![cfg_attr(bootstrap, feature(let_else))]
#![recursion_limit = "256"]
#![allow(rustc::potential_query_instability)]
#![feature(never_type)]