rust/src/test/compile-fail/borrowck-loan-local-as-both-mut-and-imm.rs

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// 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 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
2013-12-25 23:55:05 -06:00
enum Either<T, U> { Left(T), Right(U) }
fn f(x: &mut Either<int,f64>, y: &Either<int,f64>) -> int {
match *y {
Left(ref z) => {
*x = Right(1.0);
*z
}
_ => panic!()
}
}
fn g() {
let mut x: Either<int,f64> = Left(3);
println!("{}", f(&mut x, &x)); //~ ERROR cannot borrow
}
fn h() {
let mut x: Either<int,f64> = Left(3);
let y: &Either<int, f64> = &x;
let z: &mut Either<int, f64> = &mut x; //~ ERROR cannot borrow
*z = *y;
}
fn main() {}