Name a loop

Place name: before a loop to give it a label. break name exits that loop through any nested loops; continue name advances or retests it.

Labels are local to a function and visible only inside their loop body. They occupy a separate namespace from values and types.

fn main() {
  search: for row in [[1, 2], [3, 4]] {
    for cell in row {
      if cell == 3 {
        println("found $cell")
        break search
      }
    }
  }
  println("done")
}