#![feature(const_transmute)]
#![feature(core_intrinsics)]
#![feature(drain_filter)]
-#![cfg_attr(windows, feature(libc))]
#![feature(never_type)]
#![feature(exhaustive_patterns)]
#![feature(overlapping_marker_traits)]
#![feature(optin_builtin_traits)]
#![feature(option_expect_none)]
#![feature(range_is_empty)]
-#![feature(slice_patterns)]
+#![cfg_attr(bootstrap, feature(slice_patterns))]
#![feature(specialization)]
#![feature(unboxed_closures)]
#![feature(thread_local)]