42 lines
1.2 KiB
Rust
42 lines
1.2 KiB
Rust
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// Copyright 2015 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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// Ensure that OIBIT checks `T` when it encounters a `PhantomData<T>` field, instead of checking
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// the `PhantomData<T>` type itself (which almost always implements a "default" trait
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// (`impl Trait for ..`))
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#![feature(optin_builtin_traits)]
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use std::marker::{MarkerTrait, PhantomData};
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unsafe trait Zen: MarkerTrait {}
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unsafe impl Zen for .. {}
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unsafe impl<'a, T: 'a> Zen for &'a T where T: Sync {}
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struct Guard<'a, T: 'a> {
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_marker: PhantomData<&'a T>,
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}
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struct Nested<T>(T);
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fn is_zen<T: Zen>(_: T) {}
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fn not_sync<T>(x: Guard<T>) {
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is_zen(x) //~ error: the trait `core::marker::Sync` is not implemented for the type `T`
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}
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fn nested_not_sync<T>(x: Nested<Guard<T>>) {
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is_zen(x) //~ error: the trait `core::marker::Sync` is not implemented for the type `T`
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}
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fn main() {}
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