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// compile-flags: -Zverbose
// Same as: tests/ui/generator/issue-68112.stderr
#![feature(generators, generator_trait)]
use std::{
cell::RefCell,
sync::Arc,
pin::Pin,
ops::{Generator, GeneratorState},
};
pub struct Ready<T>(Option<T>);
impl<T> Generator<()> for Ready<T> {
type Return = T;
type Yield = ();
fn resume(mut self: Pin<&mut Self>, _args: ()) -> GeneratorState<(), T> {
GeneratorState::Complete(self.0.take().unwrap())
}
}
pub fn make_gen1<T>(t: T) -> Ready<T> {
Ready(Some(t))
}
fn require_send(_: impl Send) {}
fn make_non_send_generator() -> impl Generator<Return = Arc<RefCell<i32>>> {
make_gen1(Arc::new(RefCell::new(0)))
}
fn test1() {
let send_gen = || {
let _non_send_gen = make_non_send_generator();
yield;
};
require_send(send_gen);
//~^ ERROR generator cannot be sent between threads
}
pub fn make_gen2<T>(t: T) -> impl Generator<Return = T> {
|| {
yield;
t
}
}
fn make_non_send_generator2() -> impl Generator<Return = Arc<RefCell<i32>>> {
make_gen2(Arc::new(RefCell::new(0)))
}
fn test2() {
let send_gen = || {
let _non_send_gen = make_non_send_generator2();
yield;
};
require_send(send_gen);
//~^ ERROR `RefCell<i32>` cannot be shared between threads safely
}
fn main() {}
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