mirror of https://github.com/rust-lang/rust
44 lines
1.1 KiB
Rust
44 lines
1.1 KiB
Rust
//@ check-pass
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//@ edition: 2021
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#![feature(async_closure)]
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use std::future::Future;
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use std::pin::Pin;
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use std::{marker::PhantomData, sync::Mutex};
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type BoxFuture<'a, T> = Pin<Box<dyn Future<Output = T> + Send + 'a>>;
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pub struct Scope<'scope, 'env: 'scope> {
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enqueued: Mutex<Vec<BoxFuture<'scope, ()>>>,
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phantom: PhantomData<&'env ()>,
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}
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impl<'scope, 'env: 'scope> Scope<'scope, 'env> {
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pub fn spawn(&'scope self, future: impl Future<Output = ()> + Send + 'scope) {
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self.enqueued.lock().unwrap().push(Box::pin(future));
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}
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}
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fn scope_with_closure<'env, B>(_body: B) -> BoxFuture<'env, ()>
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where
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for<'scope> B: async FnOnce(&'scope Scope<'scope, 'env>),
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{
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todo!()
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}
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type ScopeRef<'scope, 'env> = &'scope Scope<'scope, 'env>;
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async fn go<'a>(value: &'a i32) {
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let closure = async |scope: ScopeRef<'_, 'a>| {
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let _future1 = scope.spawn(async {
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// Make sure that `*value` is immutably borrowed with lifetime of
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// `'a` and not with the lifetime of the containing coroutine-closure.
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let _v = *value;
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});
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};
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scope_with_closure(closure).await;
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}
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fn main() {}
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