#![feature(in_band_lifetimes)]
#![feature(array_windows)]
#![feature(assert_matches)]
-#![feature(bindings_after_at)]
+#![cfg_attr(bootstrap, feature(bindings_after_at))]
#![feature(bool_to_option)]
#![feature(box_patterns)]
#![feature(box_syntax)]
#![feature(crate_visibility_modifier)]
#![feature(decl_macro)]
#![feature(exact_size_is_empty)]
+#![feature(format_args_capture)]
#![feature(iter_zip)]
#![feature(never_type)]
#![feature(map_try_insert)]
#![feature(option_get_or_insert_default)]
#![feature(once_cell)]
#![feature(control_flow_enum)]
+#![feature(try_reserve)]
#![recursion_limit = "256"]
#[macro_use]