#![feature(binary_heap_as_slice)]
#![feature(inplace_iteration)]
#![feature(iter_advance_by)]
+#![feature(round_char_boundary)]
#![feature(slice_group_by)]
#![feature(slice_partition_dedup)]
-#![feature(vec_spare_capacity)]
#![feature(string_remove_matches)]
#![feature(const_btree_new)]
#![feature(const_default_impls)]