35 lines
1.1 KiB
Rust
35 lines
1.1 KiB
Rust
|
// Copyright 2015 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.
|
||
|
|
|
||
|
|
#![feature(unsize, coerce_unsized)]
|
||
|
|
|
||
|
|
// Verfies that non-PhantomData ZSTs still cause coercions to fail.
|
||
|
|
// They might have additional semantics that we don't want to bulldoze.
|
||
|
|
|
||
|
|
use std::marker::{Unsize, PhantomData};
|
||
|
|
use std::ops::CoerceUnsized;
|
||
|
|
|
||
|
|
struct NotPhantomData<T: ?Sized>(PhantomData<T>);
|
||
|
|
|
||
|
|
struct MyRc<T: ?Sized> {
|
||
|
|
_ptr: *const T,
|
||
|
|
_boo: NotPhantomData<T>,
|
||
|
|
}
|
||
|
|
|
||
|
|
impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<MyRc<U>> for MyRc<T>{ } //~ERROR
|
||
|
|
|
||
|
|
fn main() {
|
||
|
|
let data = [1, 2, 3];
|
||
|
|
let iter = data.iter();
|
||
|
|
let x = MyRc { _ptr: &iter, _boo: NotPhantomData(PhantomData) };
|
||
|
|
let _y: MyRc<Iterator<Item=&u32>> = x;
|
||
|
|
}
|
||
|
|
|