1 // Copyright 2012 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 enum Either<T, U> { Left(T), Right(U) }
13 struct X(Either<(uint,uint), fn()>);
16 pub fn with(&self, blk: |x: &Either<(uint,uint), fn()>|) {
23 let mut x = X(Either::Right(main as fn()));
25 |opt| { //~ ERROR cannot borrow `x` as mutable more than once at a time
27 &Either::Right(ref f) => {
28 x = X(Either::Left((0,0)));