Zig 0.16.0 was the big, recent async update. Go channels are handled as std.Io.Queue, the select keyword is handled with std.Io.Select, and goroutines are handled with std.Io.async and std.Io.concurrent. The difference between async and concurrent calls are essentially: async calls may be called concurrently, or they may not (the execution of the async function is not dependent on the caller continuing to execute - like reading a set of files), and concurrent must execute concurrently (the execution of the concurrent function depends on the caller continuing to execute - like a client+server interaction, and will crash if the environment cannot spawn concurrent processes).

The fully userspace implementation is a bit more syntactically clunky than the concurrency primitives in Go, but it is very similar semantically.