PSA: FIDL Rust tables now implement Default

[Mitchell Kember]

You can stop reading if you don't use the FIDL Rust bindings.

As of fxr/844716, FIDL tables implement the Default trait. Instead of constructing tables like this:

// "Struct update" style

let my_table = MyTable {

    foo: Some(42),

    ..MyTable::EMPTY

};

// Assignment style

let my_table = MyTable::EMPTY;

my_table.foo = Some(42);

You should now construct them like this:

// "Struct update" style

let my_table = MyTable {

    foo: Some(42),

    ..Default::default()

};

// Assignment style

let my_table = MyTable::default();

my_table.foo = Some(42);

I will migrate all existing code and remove the EMPTY constant when I'm done.

See fxb/102876 if you're curious for more details.

Mitchell

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