op =

impl Vec3 {
  static op +(a: Vec3, b: Vec3) -> Vec3 => Vec3(a.x + b.x, a.y + b.y, a.z + b.z)
  static op *(v: Vec3, k: f32) -> Vec3 => Vec3(v.x * k, v.y * k, v.z * k)
  static op -(v: Vec3) -> Vec3 => v * -1.0
  op [](i: usize) -> f32 { … }            // read by index
  var op [](i: usize) -> &var f32 { … }   // write by index
  op ()(t: f32) -> Vec3 { … }             // call as a function
  static op <=>(a: Vec3, b: Vec3) -> Ordering { … }
  op as Vec4 => Vec4(x, y, z, 1.0)
}

let inc = x => x + 1
let add = (a: i32, b: i32) => a + b
users.map(.name)                     // = u => u.name
users.filter(.isActive())            // = u => u.isActive()
retryWith(3) { fetch() }             // a closure as the last argument
cluster.lock("k", ttl: LOCK_TTL) { migrate() }