57 lines
1.5 KiB
Rust
57 lines
1.5 KiB
Rust
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// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// Tests that two closures cannot simultaneously have mutable
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// access to the variable, whether that mutable access be used
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// for direct assignment or for taking mutable ref. Issue #6801.
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fn a() {
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let mut x = 3;
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let c1 = || x = 4;
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let c2 = || x = 5; //~ ERROR cannot borrow `x` as mutable more than once
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}
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fn set(x: &mut int) {
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*x = 4;
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}
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fn b() {
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let mut x = 3;
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let c1 = || set(&mut x);
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let c2 = || set(&mut x); //~ ERROR cannot borrow `x` as mutable more than once
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}
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fn c() {
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let mut x = 3;
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let c1 = || x = 5;
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let c2 = || set(&mut x); //~ ERROR cannot borrow `x` as mutable more than once
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}
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fn d() {
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let mut x = 3;
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let c1 = || x = 5;
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let c2 = || { let _y = || set(&mut x); }; // (nested closure)
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//~^ ERROR cannot borrow `x` as mutable more than once
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}
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fn g() {
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struct Foo {
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f: ~int
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}
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let mut x = ~Foo { f: ~3 };
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let c1 = || set(&mut *x.f);
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let c2 = || set(&mut *x.f);
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//~^ ERROR cannot borrow `x` as mutable more than once
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}
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fn main() {
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}
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