rust/tests/ui/kindck/kindck-send-object.rs

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// Test which of the builtin types are considered sendable. The tests
// in this file all test the "kind" violates detected during kindck.
// See all `regions-bounded-by-send.rs`
fn assert_send<T:Send>() { }
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trait Dummy { }
trait Message : Send { }
// careful with object types, who knows what they close over...
fn object_ref_with_static_bound_not_ok() {
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assert_send::<&'static (dyn Dummy + 'static)>();
//~^ ERROR `(dyn Dummy + 'static)` cannot be shared between threads safely [E0277]
}
fn box_object_with_no_bound_not_ok<'a>() {
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assert_send::<Box<dyn Dummy>>();
//~^ ERROR `dyn Dummy` cannot be sent between threads safely
}
fn object_with_send_bound_ok() {
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assert_send::<&'static (dyn Dummy + Sync)>();
assert_send::<Box<dyn Dummy + Send>>();
}
fn main() { }