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