56 lines
1.8 KiB
Rust
56 lines
1.8 KiB
Rust
// Copyright 2012-2014 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.
|
|
|
|
// The regression test for #15031 to make sure destructuring trait
|
|
// reference work properly.
|
|
|
|
#![feature(box_patterns)]
|
|
#![feature(box_syntax)]
|
|
|
|
trait T { fn foo(&self) {} }
|
|
impl T for isize {}
|
|
|
|
fn main() {
|
|
// For an expression of the form:
|
|
//
|
|
// let &...&x = &..&SomeTrait;
|
|
//
|
|
// Say we have n `&` at the left hand and m `&` right hand, then:
|
|
// if n < m, we are golden;
|
|
// if n == m, it's a derefing non-derefable type error;
|
|
// if n > m, it's a type mismatch error.
|
|
|
|
// n < m
|
|
let &x = &(&1isize as &T);
|
|
let &x = &&(&1isize as &T);
|
|
let &&x = &&(&1isize as &T);
|
|
|
|
// n == m
|
|
let &x = &1isize as &T; //~ ERROR type `&dyn T` cannot be dereferenced
|
|
let &&x = &(&1isize as &T); //~ ERROR type `&dyn T` cannot be dereferenced
|
|
let box x = box 1isize as Box<T>; //~ ERROR type `std::boxed::Box<dyn T>` cannot be dereferenced
|
|
|
|
// n > m
|
|
let &&x = &1isize as &T;
|
|
//~^ ERROR mismatched types
|
|
//~| expected type `dyn T`
|
|
//~| found type `&_`
|
|
//~| expected trait T, found reference
|
|
let &&&x = &(&1isize as &T);
|
|
//~^ ERROR mismatched types
|
|
//~| expected type `dyn T`
|
|
//~| found type `&_`
|
|
//~| expected trait T, found reference
|
|
let box box x = box 1isize as Box<T>;
|
|
//~^ ERROR mismatched types
|
|
//~| expected type `dyn T`
|
|
//~| found type `std::boxed::Box<_>`
|
|
}
|