notes: """
  CoffeeScript doesn't supprot adding `when` clauses that are empty, as you
  probably would in JavaScript. When an empty `case` is used just before
  `default:`, it is effectively useless and is stripped away.
"""
----
switch (a) {
  case one:
    b();
    break;
  case two:
  default:
    c();
}
----
switch a
  when one
    b()
  else
    c()