protocol Show<T> {
  function show(value: T) -> string
}

using handle = open() {
  defer handle.close()
}

let arrays = [for value in values if value > 0 => value * 2]
let sets = set { for value in values => value }
let maps = map { for value in values => value: value * 2 }

let updated = User { ...base, name: "Ada" }
let explicit = Map.new<string, List<int>>(entries)

let result = loop 'search {
  if ready {
    break 'search 42
  }
  continue 'search
}

let joined = concurrent(timeout: 3s) {
  left: loadLeft()
  right: loadRight()
} else {
  fallback()
}