Structs

A struct is a named group of typed fields. A literal provides every field in any order. Spread update starts from an existing value, then replaces the named fields that follow.

Field assignment requires a mutable root. Struct patterns mirror the declaration and may name, refine, or ignore fields.

struct Point {
  x: int,
  y: int,
}

fn main() {
  let origin = Point { x: 0, y: 2 }
  let moved = Point { ...origin, x: 3 }
  println("${moved.x},${moved.y}")
}