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28 lines
500 B
Rust
28 lines
500 B
Rust
// compile-flags: -Ztrait-solver=next
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// edition: 2021
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// revisions: pass fail
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//[pass] check-pass
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#![feature(negative_impls)]
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struct NotSync;
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impl !Sync for NotSync {}
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async fn foo() {
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#[cfg(pass)]
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let x = &();
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#[cfg(fail)]
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let x = &NotSync;
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bar().await;
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#[allow(dropping_references)]
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drop(x);
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}
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async fn bar() {}
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fn main() {
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fn is_send(_: impl Send) {}
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is_send(foo());
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//[fail]~^ ERROR `impl Future<Output = ()>` cannot be sent between threads safely
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}
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