#![feature(const_cstr_unchecked)]
#![feature(const_fn_floating_point_arithmetic)]
#![feature(const_fn_fn_ptr_basics)]
+#![feature(const_fn_trait_bound)]
#![feature(const_format_args)]
#![feature(const_io_structs)]
#![feature(const_ip)]
#![feature(exact_size_is_empty)]
#![feature(exhaustive_patterns)]
#![feature(extend_one)]
-#![feature(float_interpolation)]
#![feature(fn_traits)]
#![feature(format_args_nl)]
#![feature(gen_future)]