#![feature(extend_one)]
#![feature(fmt_internals)]
#![feature(fn_traits)]
+#![feature(hasher_prefixfree_extras)]
#![feature(inplace_iteration)]
#![feature(iter_advance_by)]
#![feature(layout_for_ptr)]
#![feature(pattern)]
#![feature(ptr_internals)]
#![feature(ptr_metadata)]
+#![feature(ptr_sub_ptr)]
#![feature(receiver_trait)]
#![feature(set_ptr_value)]
#![feature(slice_group_by)]