#![feature(crate_visibility_modifier)]
#![feature(derive_default_enum)]
+#![feature(let_else)]
#![feature(min_specialization)]
#![feature(once_cell)]
#![recursion_limit = "256"]
-#![cfg_attr(not(bootstrap), allow(rustc::potential_query_instability))]
+#![allow(rustc::potential_query_instability)]
#[macro_use]
extern crate rustc_macros;