#![feature(nll)]
#![feature(optin_builtin_traits)]
#![feature(pattern)]
-#![feature(pin)]
#![feature(ptr_internals)]
#![feature(ptr_offset_from)]
#![feature(rustc_attrs)]
+#![feature(receiver_trait)]
#![feature(specialization)]
#![feature(split_ascii_whitespace)]
#![feature(staged_api)]