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Added test for rust-lang#45697
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davidtwco committed Jan 27, 2018
1 parent 6272b60 commit dd6b005
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35 changes: 35 additions & 0 deletions src/test/ui/issue-45697.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.

// Test that assignments to an `&mut` pointer which is found in a
// borrowed (but otherwise non-aliasable) location is illegal.

// compile-flags: -Z emit-end-regions -Z borrowck=compare

struct S<'a> {
pointer: &'a mut isize
}

fn copy_borrowed_ptr<'a>(p: &'a mut S<'a>) -> S<'a> {
S { pointer: &mut *p.pointer }
}

fn main() {
let mut x = 1;

{
let mut y = S { pointer: &mut x };
let z = copy_borrowed_ptr(&mut y);
*y.pointer += 1;
//~^ ERROR cannot assign to `*y.pointer` because it is borrowed (Ast) [E0506]
//~| ERROR cannot assign to `*y.pointer` because it is borrowed (Mir) [E0506]
*z.pointer += 1;
}
}
18 changes: 18 additions & 0 deletions src/test/ui/issue-45697.stderr
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error[E0506]: cannot assign to `*y.pointer` because it is borrowed (Ast)
--> $DIR/issue-45697.rs:30:9
|
29 | let z = copy_borrowed_ptr(&mut y);
| - borrow of `*y.pointer` occurs here
30 | *y.pointer += 1;
| ^^^^^^^^^^^^^^^ assignment to borrowed `*y.pointer` occurs here

error[E0506]: cannot assign to `*y.pointer` because it is borrowed (Mir)
--> $DIR/issue-45697.rs:30:9
|
29 | let z = copy_borrowed_ptr(&mut y);
| ------ borrow of `*y.pointer` occurs here
30 | *y.pointer += 1;
| ^^^^^^^^^^^^^^^ assignment to borrowed `*y.pointer` occurs here

error: aborting due to 2 previous errors

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