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Higher-Rank Trait Bounds (HRTBs) are tricky to use with generic async functions:

where 
     F: for<'a> Fn(&'a …) -> Fut, 
     Fut: Future<Output = 'a …> // can't use the lifetime here!

The async_fn_traits crate contains a workaround in the form of async function traits:

where F: for<'a> AsyncFn1<&'a …, Output = 'a …> // works!
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