41 lines
1.2 KiB
Rust
41 lines
1.2 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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fn borrow_mut<T>(x: &mut T) -> &mut T { x }
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fn borrow<T>(x: &T) -> &T { x }
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fn borrow_mut2<T>(_: &mut T, _: &mut T) {}
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fn borrow2<T>(_: &mut T, _: &T) {}
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fn double_mut_borrow<T>(x: &mut Box<T>) {
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let y = borrow_mut(x);
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let z = borrow_mut(x);
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//~^ ERROR cannot borrow `*x` as mutable more than once at a time
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}
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fn double_imm_borrow(x: &mut Box<i32>) {
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let y = borrow(x);
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let z = borrow(x);
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**x += 1;
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//~^ ERROR cannot assign to `**x` because it is borrowed
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}
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fn double_mut_borrow2<T>(x: &mut Box<T>) {
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borrow_mut2(x, x);
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//~^ ERROR cannot borrow `*x` as mutable more than once at a time
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}
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fn double_borrow2<T>(x: &mut Box<T>) {
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borrow2(x, x);
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//~^ ERROR cannot borrow `*x` as immutable because it is also borrowed as mutable
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}
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pub fn main() {}
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