// Copyright 2012 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. enum option { some(T), none, } struct R {v: ~[option]} fn f() -> ~[T] { return ~[]; } pub fn main() { let mut r: R = R {v: ~[]}; r.v = f(); }