File: issue-98604.rs

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rustc 1.88.0%2Bdfsg1-1
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//@ edition:2018

type AsyncFnPtr = Box<dyn Fn() -> std::pin::Pin<Box<dyn std::future::Future<Output = ()>>>>;

async fn test() {}

#[allow(unused_must_use)]
fn main() {
    Box::new(test) as AsyncFnPtr;
    //~^ ERROR expected `test` to return `Pin<Box<dyn Future<Output = ()>>>`, but it returns `impl Future<Output = ()>
}