rust/src/test/compile-fail/borrowck-lend-flow-if.rs
Patrick Walton 090040bf40 librustc: Remove ~EXPR, ~TYPE, and ~PAT from the language, except
for `~str`/`~[]`.

Note that `~self` still remains, since I forgot to add support for
`Box<self>` before the snapshot.

How to update your code:

* Instead of `~EXPR`, you should write `box EXPR`.

* Instead of `~TYPE`, you should write `Box<Type>`.

* Instead of `~PATTERN`, you should write `box PATTERN`.

[breaking-change]
2014-05-06 23:12:54 -07:00

54 lines
1.4 KiB
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.
// Note: the borrowck analysis is currently flow-insensitive.
// Therefore, some of these errors are marked as spurious and could be
// corrected by a simple change to the analysis. The others are
// either genuine or would require more advanced changes. The latter
// cases are noted.
fn borrow(_v: &int) {}
fn borrow_mut(_v: &mut int) {}
fn cond() -> bool { fail!() }
fn for_func(_f: || -> bool) { fail!() }
fn produce<T>() -> T { fail!(); }
fn inc(v: &mut Box<int>) {
*v = box() (**v + 1);
}
fn pre_freeze_cond() {
// In this instance, the freeze is conditional and starts before
// the mut borrow.
let mut v = box 3;
let _w;
if cond() {
_w = &v;
}
borrow_mut(v); //~ ERROR cannot borrow
}
fn pre_freeze_else() {
// In this instance, the freeze and mut borrow are on separate sides
// of the if.
let mut v = box 3;
let _w;
if cond() {
_w = &v;
} else {
borrow_mut(v);
}
}
fn main() {}