28 lines
950 B
Rust
28 lines
950 B
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 freeze an `&mut` pointer while referent is
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// claimed yields an error.
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//
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// Example from src/middle/borrowck/doc.rs
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use std::util::swap;
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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: &mut int = &mut *t0; // Claims `*t0`
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let mut t2 = &t0; //~ ERROR cannot borrow `t0`
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let q: &int = &**t2; // Freezes `*t0` but not through `*p`
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*p += 1; // violates type of `*q`
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}
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fn main() {
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}
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