270f0eef73
This is the kind of change that one is expected to need to make to accommodate overloaded-`box`. ---- Note that this is not *all* of the changes necessary to accommodate Issue 22181. It is merely the subset of those cases where there was already a let-binding in place that made it easy to add the necesasry type ascription. (For unnamed intermediate `Box` values, one must go down a different route; `Box::new` is the option that maximizes portability, but has potential inefficiency depending on whether the call is inlined.) ---- There is one place worth note, `run-pass/coerce-match.rs`, where I used an ugly form of `Box<_>` type ascription where I would have preferred to use `Box::new` to accommodate overloaded-`box`. I deliberately did not use `Box::new` here, because that is already done in coerce-match-calls.rs. ---- Precursor for overloaded-`box` and placement-`in`; see Issue 22181.
156 lines
3.8 KiB
Rust
156 lines
3.8 KiB
Rust
// Copyright 2014 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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#![feature(box_syntax)]
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struct A {
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x: Box<isize>,
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y: isize,
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}
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struct B {
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x: Box<isize>,
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y: Box<isize>,
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}
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struct C {
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x: Box<A>,
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y: isize,
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}
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struct D {
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x: Box<A>,
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y: Box<isize>,
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}
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fn copy_after_move() {
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let a: Box<_> = box A { x: box 0, y: 1 };
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let _x = a.x;
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let _y = a.y; //~ ERROR use of moved
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//~^^ NOTE `a` moved here (through moving `a.x`)
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}
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fn move_after_move() {
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let a: Box<_> = box B { x: box 0, y: box 1 };
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let _x = a.x;
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let _y = a.y; //~ ERROR use of moved
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//~^^ NOTE `a` moved here (through moving `a.x`)
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}
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fn borrow_after_move() {
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let a: Box<_> = box A { x: box 0, y: 1 };
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let _x = a.x;
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let _y = &a.y; //~ ERROR use of moved
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//~^^ NOTE `a` moved here (through moving `a.x`)
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}
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fn move_after_borrow() {
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let a: Box<_> = box B { x: box 0, y: box 1 };
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let _x = &a.x;
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let _y = a.y; //~ ERROR cannot move
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}
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fn copy_after_mut_borrow() {
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let mut a: Box<_> = box A { x: box 0, y: 1 };
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let _x = &mut a.x;
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let _y = a.y; //~ ERROR cannot use
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}
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fn move_after_mut_borrow() {
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let mut a: Box<_> = box B { x: box 0, y: box 1 };
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let _x = &mut a.x;
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let _y = a.y; //~ ERROR cannot move
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}
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fn borrow_after_mut_borrow() {
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let mut a: Box<_> = box A { x: box 0, y: 1 };
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let _x = &mut a.x;
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let _y = &a.y; //~ ERROR cannot borrow
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}
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fn mut_borrow_after_borrow() {
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let mut a: Box<_> = box A { x: box 0, y: 1 };
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let _x = &a.x;
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let _y = &mut a.y; //~ ERROR cannot borrow
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}
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fn copy_after_move_nested() {
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let a: Box<_> = box C { x: box A { x: box 0, y: 1 }, y: 2 };
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let _x = a.x.x;
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let _y = a.y; //~ ERROR use of collaterally moved
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}
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fn move_after_move_nested() {
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let a: Box<_> = box D { x: box A { x: box 0, y: 1 }, y: box 2 };
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let _x = a.x.x;
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let _y = a.y; //~ ERROR use of collaterally moved
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}
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fn borrow_after_move_nested() {
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let a: Box<_> = box C { x: box A { x: box 0, y: 1 }, y: 2 };
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let _x = a.x.x;
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let _y = &a.y; //~ ERROR use of collaterally moved
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}
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fn move_after_borrow_nested() {
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let a: Box<_> = box D { x: box A { x: box 0, y: 1 }, y: box 2 };
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let _x = &a.x.x;
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let _y = a.y; //~ ERROR cannot move
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}
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fn copy_after_mut_borrow_nested() {
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let mut a: Box<_> = box C { x: box A { x: box 0, y: 1 }, y: 2 };
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let _x = &mut a.x.x;
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let _y = a.y; //~ ERROR cannot use
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}
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fn move_after_mut_borrow_nested() {
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let mut a: Box<_> = box D { x: box A { x: box 0, y: 1 }, y: box 2 };
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let _x = &mut a.x.x;
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let _y = a.y; //~ ERROR cannot move
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}
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fn borrow_after_mut_borrow_nested() {
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let mut a: Box<_> = box C { x: box A { x: box 0, y: 1 }, y: 2 };
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let _x = &mut a.x.x;
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let _y = &a.y; //~ ERROR cannot borrow
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}
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fn mut_borrow_after_borrow_nested() {
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let mut a: Box<_> = box C { x: box A { x: box 0, y: 1 }, y: 2 };
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let _x = &a.x.x;
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let _y = &mut a.y; //~ ERROR cannot borrow
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}
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fn main() {
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copy_after_move();
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move_after_move();
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borrow_after_move();
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move_after_borrow();
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copy_after_mut_borrow();
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move_after_mut_borrow();
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borrow_after_mut_borrow();
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mut_borrow_after_borrow();
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copy_after_move_nested();
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move_after_move_nested();
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borrow_after_move_nested();
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move_after_borrow_nested();
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copy_after_mut_borrow_nested();
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move_after_mut_borrow_nested();
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borrow_after_mut_borrow_nested();
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mut_borrow_after_borrow_nested();
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}
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