// Copyright 2015 The Rust Project Developers. See the COPYRIGHT // file at the top-level directory of this distribution and at // http://rust-lang.org/COPYRIGHT. // // Licensed under the Apache License, Version 2.0 or the MIT license // , at your // option. This file may not be copied, modified, or distributed // except according to those terms. #![feature(no_core, core)] #![no_core] extern crate std; extern crate core; use std::option::Option::Some; fn main() { let a = Some("foo"); a.unwrap(); }