// Hello world
echo "Hello, world!"

// Fibonacci with pattern matching
fn fib(n u32) u32 =
  where n <= 1: n
  where _: fib(n - 1) + fib(n - 2)

echo fib(10)

// Structs with methods
struct person =
  name string
  age  u8

  fn init(this person) =
    echo "new person: {this.name}"

  fn show(this person) string =
    return "{this.name} is {this.age} years old"

let pete = person{name: "Pete", age: 20}
echo pete.show()

// Traits
trait named =
  label string forward
  fn name(this named) string = return this.label

struct cat(named) =
  breed string

let c = cat{label: "Whiskers", breed: "tabby"}
echo c.name()

// Fibers and channels
use sync

fn{#async} worker(id i64, ch sync::Channel[string]) =
  ch.send("result from fiber {id}")

fn main() =
  let ch = sync::Channel[string].make(4)
  spawn worker(1, ch)
  spawn worker(2, ch)
  echo await ch.recv()   // "result from fiber 1" or "2", whichever finishes first
  echo await ch.recv()

go build .
./tin