#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
#![feature(iter_intersperse)]
#![feature(let_chains)]
-#![feature(let_else)]
+#![cfg_attr(bootstrap, feature(let_else))]
#![feature(map_try_insert)]
#![feature(min_specialization)]
#![feature(try_blocks)]