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  • Ivan Zderadicka thinks this is interesting:

As you can see, if some fields of a structure implement Default, you can use the trait to complete the fields you don't want to specify, as you can see with the test1 variable. Simply specify the non-default fields, and then, after the last comma, add a couple of periods (..) and then Default::default(), so that the compiler uses the Default trait to fill the other fields. You can use any function that is generic over the rest of the fields with this syntax.

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Cover of Rust High Performance

Note

Actually whole structure must implement Default not just some fields