49 lines
1.2 KiB
Rust
49 lines
1.2 KiB
Rust
// Copyright 2012 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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struct Point {
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x: int,
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y: int,
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}
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fn a() {
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let mut p = ~[1];
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// Create an immutable pointer into p's contents:
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let _q: &int = &p[0]; //~ NOTE loan of mutable vec content granted here
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p[0] = 5; //~ ERROR assigning to mutable vec content prohibited due to outstanding loan
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}
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fn borrow(_x: &[int], _f: fn()) {}
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fn b() {
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// here we alias the mutable vector into an imm slice and try to
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// modify the original:
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let mut p = ~[1];
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do borrow(p) { //~ NOTE loan of mutable vec content granted here
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p[0] = 5; //~ ERROR assigning to mutable vec content prohibited due to outstanding loan
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}
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}
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fn c() {
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// Legal because the scope of the borrow does not include the
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// modification:
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let mut p = ~[1];
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borrow(p, ||{});
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p[0] = 5;
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}
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fn main() {
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}
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