blob: 570249aed443b5c7d5f2fdf5cd2679bec11ea801 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
// Copyright 2014 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.
// Tests that two closures cannot simultaneously have mutable
// access to the variable, whether that mutable access be used
// for direct assignment or for taking mutable ref. Issue #6801.
fn a() {
let mut x = 3;
let c1 = || x = 4;
let c2 = || x = 5; //~ ERROR cannot borrow `x` as mutable more than once
}
fn set(x: &mut int) {
*x = 4;
}
fn b() {
let mut x = 3;
let c1 = || set(&mut x);
let c2 = || set(&mut x); //~ ERROR cannot borrow `x` as mutable more than once
}
fn c() {
let mut x = 3;
let c1 = || x = 5;
let c2 = || set(&mut x); //~ ERROR cannot borrow `x` as mutable more than once
}
fn d() {
let mut x = 3;
let c1 = || x = 5;
let c2 = || { let _y = || set(&mut x); }; // (nested closure)
//~^ ERROR cannot borrow `x` as mutable more than once
}
fn g() {
struct Foo {
f: ~int
}
let mut x = ~Foo { f: ~3 };
let c1 = || set(&mut *x.f);
let c2 = || set(&mut *x.f);
//~^ ERROR cannot borrow `x` as mutable more than once
}
fn main() {
}
|
