#![feature(optin_builtin_traits)]
#![feature(panic_unwind)]
#![feature(placement_in_syntax)]
+#![feature(prelude_import)]
#![feature(question_mark)]
#![feature(rand)]
#![feature(raw)]
#![allow(unused_features)] // std may use features in a platform-specific way
#![cfg_attr(not(stage0), deny(warnings))]
+#[prelude_import]
+#[allow(unused)]
+use prelude::v1::*;
+
#[cfg(test)] extern crate test;
// We want to reexport a few macros from core but libcore has already been