html_root_url = "https://doc.rust-lang.org/nightly/")]
#![deny(warnings)]
-#![feature(associated_consts)]
#![feature(box_patterns)]
#![feature(box_syntax)]
#![feature(const_fn)]
#![feature(slice_patterns)]
#![feature(conservative_impl_trait)]
+#![cfg_attr(stage0, feature(associated_consts))]
+
use rustc::dep_graph::WorkProduct;
use syntax_pos::symbol::Symbol;