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並前往https://stackoverflow.com/questions/39482131/is-it-possible-to-use-impl-trait-as-a-functions-return-type-in-a-trait-defini

Is it possible to use `impl Trait` as a function's return type in a ...

As trentcl mentions, you cannot currently place impl Trait in the return position of a trait method. From RFC 1522: impl Trait may only be ...

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