What's the difference between `f(x: impl Trait)` and `f<T: Trait>(x: T)`?

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Is the former just a sugar?

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Yes, mostly. There are a few superficial differences, like impl Trait can't be explicitly specified in the turbofish.

Do note, however, that return-position impl Trait is very different from generics.

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The only difference is that with the latter you can call the function specifying the concrete type for T, for example f::<u32>(0)

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