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Interfaces are the most important thing Zig needs to implement ASAP

It would also help creating a uniform standard library, for example creating a Writer interface instead of having specific functions for files, sockets, buffers and all kind of types

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How are you going to implement interfaces if Zig is without classes in the first place?

Go has interfaces and doesn’t have classes.

There's quite a bit of mildly hairy runtime code necessary to achieve this.

For the equivalent thing (interfaces with runtime dispatch and without owning the underlying struct) Zig has explicit vtables. I sort of think any new "interfaces" feature should at least partly be about describing constraints on types at compile time.

i think adding interfaces that are simply enforced at compile time would be a good start

You could create a new type like Dynamic(InterfaceName) that handles dynamic dispatch somehow

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