fda3378e3f
They used to be covered by `optin_builtin_traits` but negative impls are now applicable to all traits, not just auto traits. This also adds docs in the unstable book for the current state of auto traits.
15 lines
247 B
Rust
15 lines
247 B
Rust
#![feature(negative_impls)]
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use std::marker::Sync;
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struct Foo { a: isize }
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impl !Sync for Foo {}
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fn bar<T: Sync>(_: T) {}
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fn main() {
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let x = Foo { a: 5 };
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bar(x);
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//~^ ERROR `Foo` cannot be shared between threads safely [E0277]
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}
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