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]
41 lines
856 B
Rust
41 lines
856 B
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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fn f(x: Box<int>) {
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let y: &int = &*x;
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println!("{}", *x);
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println!("{}", *y);
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}
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trait Trait {
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fn printme(&self);
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}
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struct Struct;
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impl Trait for Struct {
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fn printme(&self) {
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println!("hello world!");
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}
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}
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fn g(x: Box<Trait>) {
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x.printme();
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let y: &Trait = x;
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y.printme();
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}
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fn main() {
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f(box 1234);
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g(box Struct as Box<Trait>);
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}
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