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