32 lines
1.1 KiB
Rust
32 lines
1.1 KiB
Rust
// Copyright 2013 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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// Test that attempt to mutably borrow `&mut` pointer while pointee is
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// borrowed yields an error.
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//
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// Example from src/middle/borrowck/doc.rs
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fn foo<'a>(mut t0: &'a mut int,
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mut t1: &'a mut int) {
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let p: &int = &*t0; // Freezes `*t0`
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let mut t2 = &mut t0; //~ ERROR cannot borrow `t0`
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**t2 += 1; // Mutates `*t0`
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}
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fn bar<'a>(mut t0: &'a mut int,
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mut t1: &'a mut int) {
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let p: &mut int = &mut *t0; // Claims `*t0`
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let mut t2 = &mut t0; //~ ERROR cannot borrow `t0`
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**t2 += 1; // Mutates `*t0` but not through `*p`
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}
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fn main() {
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}
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