#![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
#![feature(bool_to_option)]
-#![feature(box_patterns)]
#![feature(core_intrinsics)]
#![feature(crate_visibility_modifier)]
#![feature(drain_filter)]
#![feature(in_band_lifetimes)]
-#![feature(libc)]
#![feature(nll)]
#![feature(proc_macro_internals)]
-#![feature(proc_macro_quote)]
-#![feature(rustc_private)]
#![feature(specialization)]
#![feature(stmt_expr_attributes)]
#![recursion_limit = "256"]