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// 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.
// Ensure that OIBIT checks `T` when it encounters a `PhantomData<T>` field, instead of checking
// the `PhantomData<T>` type itself (which almost always implements a "default" trait
// (`impl Trait for ..`))
#![feature(optin_builtin_traits)]
use std::marker::{PhantomData};
unsafe trait Zen {}
unsafe impl Zen for .. {}
unsafe impl<'a, T: 'a> Zen for &'a T where T: Sync {}
struct Guard<'a, T: 'a> {
_marker: PhantomData<&'a T>,
}
struct Nested<T>(T);
fn is_zen<T: Zen>(_: T) {}
fn not_sync<T>(x: Guard<T>) {
is_zen(x) //~ error: the trait `core::marker::Sync` is not implemented for the type `T`
}
fn nested_not_sync<T>(x: Nested<Guard<T>>) {
is_zen(x) //~ error: the trait `core::marker::Sync` is not implemented for the type `T`
}
fn main() {}
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