#![feature(hashmap_internals)]
#![feature(int_error_internals)]
#![feature(int_error_matching)]
-#![feature(into_future)]
#![feature(integer_atomics)]
#![feature(lang_items)]
#![feature(libc)]
#![feature(link_args)]
#![feature(linkage)]
#![feature(log_syntax)]
-#![feature(manually_drop_take)]
#![feature(maybe_uninit_ref)]
#![feature(maybe_uninit_slice)]
#![feature(needs_panic_runtime)]
#![feature(shrink_to)]
#![feature(slice_concat_ext)]
#![feature(slice_internals)]
-#![feature(slice_patterns)]
+#![cfg_attr(bootstrap, feature(slice_patterns))]
#![feature(specialization)]
#![feature(staged_api)]
#![feature(std_internals)]
#![feature(thread_local)]
#![feature(toowned_clone_into)]
#![feature(trace_macros)]
+#![feature(track_caller)]
#![feature(try_reserve)]
#![feature(unboxed_closures)]
#![feature(untagged_unions)]