31 lines
695 B
Rust
31 lines
695 B
Rust
// Ensure that auto trait checks `T` when it encounters a `PhantomData<T>` field, instead of
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// checking the `PhantomData<T>` type itself (which almost always implements an auto trait).
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#![feature(auto_traits)]
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use std::marker::{PhantomData};
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unsafe auto trait Zen {}
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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)
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//~^ ERROR `T` cannot be shared between threads safely [E0277]
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}
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fn nested_not_sync<T>(x: Nested<Guard<T>>) {
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is_zen(x)
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//~^ ERROR `T` cannot be shared between threads safely [E0277]
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}
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fn main() {}
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