#![feature(in_band_lifetimes)]
#![feature(nll)]
#![feature(trusted_len)]
+#![feature(mem_take)]
#![allow(unused_attributes)]
#![allow(dead_code)]
#![deny(rust_2018_idioms)]
-#![deny(internal)]
#![deny(unused_lifetimes)]
-#![allow(explicit_outlives_requirements)]
#![recursion_limit="256"]