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OIBIT: for
PhantomData<T>
check T
rather than the struct itself
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Jorge Aparicio
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Mar 5, 2015
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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. | ||
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// 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 ..`)) | ||
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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> { | ||
_marker: PhantomData<&'a T>, | ||
} | ||
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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>) { | ||
is_zen(x) //~ error: the trait `core::marker::Sync` is not implemented for the type `T` | ||
} | ||
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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` | ||
} | ||
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fn main() {} |