rust/tests/ui/generator/issue-68112.rs

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#![feature(generators, generator_trait)]
use std::{
cell::RefCell,
sync::Arc,
pin::Pin,
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ops::{Coroutine, CoroutineState},
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};
pub struct Ready<T>(Option<T>);
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impl<T: Unpin> Coroutine<()> for Ready<T> {
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type Return = T;
type Yield = ();
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fn resume(mut self: Pin<&mut Self>, _args: ()) -> CoroutineState<(), T> {
CoroutineState::Complete(self.0.take().unwrap())
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}
}
pub fn make_gen1<T>(t: T) -> Ready<T> {
Ready(Some(t))
}
fn require_send(_: impl Send) {}
//~^ NOTE required by a bound
//~| NOTE required by a bound
//~| NOTE required by this bound
//~| NOTE required by this bound
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fn make_non_send_generator() -> impl Coroutine<Return = Arc<RefCell<i32>>> {
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make_gen1(Arc::new(RefCell::new(0)))
}
fn test1() {
let send_gen = || {
let _non_send_gen = make_non_send_generator();
//~^ NOTE not `Send`
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yield;
//~^ NOTE yield occurs here
//~| NOTE value is used across a yield
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};
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require_send(send_gen);
//~^ ERROR generator cannot be sent between threads
//~| NOTE not `Send`
//~| NOTE use `std::sync::RwLock` instead
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}
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pub fn make_gen2<T>(t: T) -> impl Coroutine<Return = T> {
//~^ NOTE appears within the type
//~| NOTE expansion of desugaring
|| { //~ NOTE used within this generator
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yield;
t
}
}
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fn make_non_send_generator2() -> impl Coroutine<Return = Arc<RefCell<i32>>> { //~ NOTE appears within the type
//~^ NOTE expansion of desugaring
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make_gen2(Arc::new(RefCell::new(0)))
}
fn test2() {
let send_gen = || { //~ NOTE used within this generator
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let _non_send_gen = make_non_send_generator2();
yield;
};
require_send(send_gen);
//~^ ERROR `RefCell<i32>` cannot be shared between threads safely
//~| NOTE `RefCell<i32>` cannot be shared between threads safely
//~| NOTE required for
//~| NOTE captures the following types
//~| NOTE use `std::sync::RwLock` instead
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}
fn main() {}