anchor: love.event.wait
  Like love.event.poll(), but blocks until there is an event in the queue.
  n, a, b, c, d, e, f, ... = love.event.wait()
  n Event The name of event.
  a Variant First event argument.
  b Variant Second event argument.
  c Variant Third event argument.
  d Variant Fourth event argument.
  e Variant Fifth event argument.
  f Variant Sixth event argument.
  ... Variant Further event arguments may follow.