#![feature(borrow_state)]
#![feature(box_syntax)]
#![feature(cell_extras)]
+#![feature(char_escape_debug)]
#![feature(const_fn)]
#![feature(core_private_bignum)]
#![feature(core_private_diy_float)]
#![feature(slice_patterns)]
#![feature(step_by)]
#![feature(test)]
+#![feature(try_from)]
#![feature(unboxed_closures)]
#![feature(unicode)]
#![feature(unique)]
-#![feature(try_from)]
extern crate core;
extern crate test;