rust/src/test/compile-fail/regions-infer-borrow-scope-within-loop.rs

31 lines
903 B
Rust

// 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.
#[feature(managed_boxes)];
fn borrow<'r, T>(x: &'r T) -> &'r T {x}
fn foo(cond: || -> bool, make_box: || -> @int) {
let mut y: &int;
loop {
let x = make_box();
// Here we complain because the resulting region
// of this borrow is the fn body as a whole.
y = borrow(x); //~ ERROR cannot root
assert_eq!(*x, *y);
if cond() { break; }
}
assert!(*y != 0);
}
fn main() {}