mirror of https://github.com/rust-lang/rust
61 lines
1.4 KiB
Rust
61 lines
1.4 KiB
Rust
//@ compile-flags: -Zverbose-internals
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// Same as: tests/ui/coroutine/issue-68112.stderr
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#![feature(coroutines, coroutine_trait, stmt_expr_attributes)]
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use std::{
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cell::RefCell,
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sync::Arc,
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pin::Pin,
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ops::{Coroutine, CoroutineState},
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};
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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;
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type Yield = ();
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fn resume(mut self: Pin<&mut Self>, _args: ()) -> CoroutineState<(), T> {
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CoroutineState::Complete(self.0.take().unwrap())
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}
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}
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pub fn make_gen1<T>(t: T) -> Ready<T> {
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Ready(Some(t))
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}
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fn require_send(_: impl Send) {}
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fn make_non_send_coroutine() -> impl Coroutine<Return = Arc<RefCell<i32>>> {
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make_gen1(Arc::new(RefCell::new(0)))
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}
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fn test1() {
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let send_gen = #[coroutine] || {
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let _non_send_gen = make_non_send_coroutine();
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yield;
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};
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require_send(send_gen);
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//~^ ERROR coroutine cannot be sent between threads
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}
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pub fn make_gen2<T>(t: T) -> impl Coroutine<Return = T> {
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#[coroutine] || {
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yield;
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t
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}
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}
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fn make_non_send_coroutine2() -> impl Coroutine<Return = Arc<RefCell<i32>>> {
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make_gen2(Arc::new(RefCell::new(0)))
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}
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fn test2() {
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let send_gen = #[coroutine] || {
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let _non_send_gen = make_non_send_coroutine2();
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yield;
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};
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require_send(send_gen);
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//~^ ERROR `RefCell<i32>` cannot be shared between threads safely
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}
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fn main() {}
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