#![feature(alloc_layout_extra)]
#![feature(assert_matches)]
#![feature(box_syntax)]
+#![feature(btree_drain_filter)]
#![feature(cow_is_borrowed)]
#![feature(const_box)]
#![feature(const_convert)]
#![feature(core_intrinsics)]
#![feature(drain_filter)]
#![feature(exact_size_is_empty)]
+#![feature(linked_list_cursors)]
+#![feature(map_try_insert)]
#![feature(new_uninit)]
#![feature(pattern)]
#![feature(trusted_len)]
use std::hash::{Hash, Hasher};
mod arc;
+mod autotraits;
mod borrow;
mod boxed;
mod btree_set_hash;