#![feature(box_patterns)]
#![feature(box_syntax)]
+#![feature(const_if_match)]
+#![feature(const_fn)]
+#![feature(const_panic)]
#![feature(crate_visibility_modifier)]
-#![cfg_attr(bootstrap, feature(slice_patterns))]
#![feature(bool_to_option)]
#![recursion_limit = "256"]