de70d76373
except where trait objects are involved. Part of issue #15349, though I'm leaving it open for trait objects. Cross borrowing for trait objects remains because it is needed until we have DST. This will break code like: fn foo(x: &int) { ... } let a = box 3i; foo(a); Change this code to: fn foo(x: &int) { ... } let a = box 3i; foo(&*a); [breaking-change]
45 lines
1.1 KiB
Rust
45 lines
1.1 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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// Test that we detect nested calls that could free pointers evaluated
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// for earlier arguments.
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fn rewrite(v: &mut Box<uint>) -> uint {
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*v = box 22;
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**v
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}
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fn add(v: &uint, w: Box<uint>) -> uint {
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*v + *w
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}
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fn implicit() {
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let mut a = box 1;
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// Note the danger here:
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//
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// the pointer for the first argument has already been
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// evaluated, but it gets moved when evaluating the second
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// argument!
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add(
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&*a,
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a); //~ ERROR cannot move
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}
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fn explicit() {
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let mut a = box 1;
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add(
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&*a,
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a); //~ ERROR cannot move
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}
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fn main() {}
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