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.
17 lines
270 B
Rust
17 lines
270 B
Rust
#![feature(negative_impls)]
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use std::marker::Sync;
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struct NoSync;
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impl !Sync for NoSync {}
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enum Foo { A(NoSync) }
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fn bar<T: Sync>(_: T) {}
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fn main() {
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let x = Foo::A(NoSync);
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bar(x);
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//~^ ERROR `NoSync` cannot be shared between threads safely [E0277]
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}
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