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[rustc.git] / src / test / compile-fail / phantom-oibit.rs
1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
4 //
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
10
11 // Ensure that OIBIT checks `T` when it encounters a `PhantomData<T>` field, instead of checking
12 // the `PhantomData<T>` type itself (which almost always implements a "default" trait
13 // (`impl Trait for ..`))
14
15 #![feature(optin_builtin_traits)]
16
17 use std::marker::{PhantomData};
18
19 unsafe trait Zen {}
20
21 unsafe impl Zen for .. {}
22
23 unsafe impl<'a, T: 'a> Zen for &'a T where T: Sync {}
24
25 struct Guard<'a, T: 'a> {
26 _marker: PhantomData<&'a T>,
27 }
28
29 struct Nested<T>(T);
30
31 fn is_zen<T: Zen>(_: T) {}
32
33 fn not_sync<T>(x: Guard<T>) {
34 is_zen(x) //~ error: `T: std::marker::Sync` is not satisfied
35 }
36
37 fn nested_not_sync<T>(x: Nested<Guard<T>>) {
38 is_zen(x) //~ error: `T: std::marker::Sync` is not satisfied
39 }
40
41 fn main() {}