html_root_url = "https://doc.rust-lang.org/nightly/")]
#![deny(warnings)]
-#![feature(associated_consts)]
#![feature(box_patterns)]
#![feature(box_syntax)]
#![feature(conservative_impl_trait)]
#![feature(trace_macros)]
#![feature(test)]
+#![cfg_attr(stage0, feature(associated_consts))]
+
#![recursion_limit="256"]
extern crate arena;