Usually you return a closure with impl Fn. Another use case is to return an iter... | Hacker News

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		iopq on June 1, 2018 \| parent \| context \| favorite \| on: Actix: a small, pragmatic, and fast Rust web frame... Usually you return a closure with impl Fn. Another use case is to return an iterator. I wrote a post about it. Let me know if it helps. https://medium.com/@iopguy/impl-trait-in-rust-explanation-ef...

ejanus on June 3, 2018 [–]

Your code is nothing but Magic . I have spent time trying to wrap my head around it. I am almost there but I don't understand .map(<&str>::into) . Monoid implements String

ejanus on June 4, 2018 | [–]

Finally, that code is itched in my brain

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