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goto_lbl. Go to label Control
label_lbl. (target label) Control

Valid only inside an explicit definition.

Make the labelled statement the next statement to be executed

f=: 3 : 0
  if. y do. goto_true. else. goto_false. end.
  label_true.  'true'  return.
  label_false. 'false' return.

   f 0

   f 1