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並前往https://medium.com/journey-to-rust/das-is-fn-tastish-82d3d72c2027

Das is Fn-tastish. Trying to understand Fn in Rust - Medium

expected `(dyn std::ops::Fn() -> bool + 'static)` because of return type 6 | x | ^ expected trait std::ops::Fn, found fn item

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