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tests/ui/async-await/in-trait/normalize-opaque-with-bound-vars.rs
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// build-pass | ||
// edition:2021 | ||
// compile-flags: -Cdebuginfo=2 | ||
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// We were not normalizing opaques with escaping bound vars during codegen, | ||
// leading to later errors during debuginfo computation. | ||
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#![feature(async_fn_in_trait)] | ||
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#[derive(Clone, Copy)] | ||
pub struct SharedState {} | ||
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pub trait State { | ||
async fn execute(self, shared_state: &SharedState); | ||
} | ||
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pub trait StateComposer { | ||
fn and_then<T, F>(self, map_fn: F) -> AndThen<Self, F> | ||
where | ||
Self: State + Sized, | ||
T: State, | ||
F: FnOnce() -> T, | ||
{ | ||
AndThen { previous: self, map_fn } | ||
} | ||
} | ||
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impl<T> StateComposer for T where T: State {} | ||
pub struct AndThen<T, F> { | ||
previous: T, | ||
map_fn: F, | ||
} | ||
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impl<T, U, F> State for AndThen<T, F> | ||
where | ||
T: State, | ||
U: State, | ||
F: FnOnce() -> U, | ||
{ | ||
async fn execute(self, shared_state: &SharedState) | ||
where | ||
Self: Sized, | ||
{ | ||
self.previous.execute(shared_state).await; | ||
(self.map_fn)().execute(shared_state).await | ||
} | ||
} | ||
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pub struct SomeState {} | ||
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impl State for SomeState { | ||
async fn execute(self, shared_state: &SharedState) {} | ||
} | ||
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pub fn main() { | ||
let shared_state = SharedState {}; | ||
async { | ||
SomeState {} | ||
.and_then(|| SomeState {}) | ||
.and_then(|| SomeState {}) | ||
.execute(&shared_state) | ||
.await; | ||
}; | ||
} |
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// build-pass | ||
// edition:2021 | ||
// compile-flags: -Cdebuginfo=2 | ||
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// We were not normalizing opaques with escaping bound vars during codegen, | ||
// leading to later linker errors because of differences in mangled symbol name. | ||
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fn func<T>() -> impl Sized {} | ||
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trait Trait<'a> { | ||
type Assoc; | ||
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fn call() { | ||
let _ = async { | ||
let _value = func::<Self::Assoc>(); | ||
std::future::ready(()).await | ||
}; | ||
} | ||
} | ||
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impl Trait<'static> for () { | ||
type Assoc = (); | ||
} | ||
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fn main() { | ||
<()>::call(); | ||
} |