#![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
#![feature(bool_to_option)]
#![feature(box_patterns)]
-#![feature(box_syntax)]
-#![feature(core_intrinsics)]
-#![feature(libc)]
-#![feature(stmt_expr_attributes)]
#![feature(try_blocks)]
#![feature(in_band_lifetimes)]
#![feature(nll)]