Trait AssertSend 

pub trait AssertSend: Future {
    // Provided method
    fn send(self) -> impl Future<Output = Self::Output> + Send
       where Self: Sized + Send { ... }
}

If your future is not Send enough, try this.

Async functions (i.e., those with the keyword async) rely on type inference to automatically derive Send and Sync bounds for the returned Futures. Unfortunately, rustc seems to throw away quite a bit of information when building large futures like we have in diskann_async, which can result in large futures failing to be Send due to the bound on an inner Future being forgotten.

The AssertSend is a hack that helps rustc realize that interior Futures are indeed Send and helps when proving the auto trait for larger Futures.

This is mainly helpful when async functions take closures.

Provided Methods

fn send(self) -> impl Future<Output = Self::Output> + Send

where Self: Sized + Send,

Implementors

impl<T: Future> AssertSend for T