Ancestors

Written by Esteban Küber :rust: on 2024-12-10 at 16:21

I can't wait to see how people use default field values in #Rust!

It felt like an eternity to land this (specially if we count the years of discussion before the, I believe, 3rd RFC was accepted), but as of next nightly you will be able to write

struct Foo {

bar: Type = Type::const_method(),

}

Foo { .. } // implicit bar: Type::const_method() call

The main difference between https://github.com/rust-lang/rust/pull/129514 and derive(Default) is that the latter doesn't support having mandatory fields.

[#]RustLang

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Written by Esteban Küber :rust: on 2024-12-11 at 17:43

Default fields values are now live on nightly #Rust! Go wild and report bugs 😃

[#]RustLang

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Written by Jacob Pratt on 2024-12-11 at 23:47

@ekuber Prefer issues be opened as usual, DM, or something else?

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Toot

Written by Esteban Küber :rust: on 2024-12-12 at 00:15

@jhpratt tickets on the issue tracker referencing the tracking issue and tagged as F-default_field_values would be best

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Descendants

Written by Jacob Pratt on 2024-12-14 at 05:09

@ekuber Took maybe an hour to figure out how to minimize it, but the first bug for the feature is now open :)

https://github.com/rust-lang/rust/issues/134298

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Written by Esteban Küber :rust: on 2024-12-14 at 05:39

@jhpratt it looks like I need to extend what the Well formed check does for structs with defaults. You would think that they stretch without a default would also error.

This is a nice milestone!

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Written by Jacob Pratt on 2024-12-14 at 05:49

@ekuber it's heavily minimized from real-world code in the time crate (with the addition of default values). Inference is a wonderful thing!

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