Programmer Guide/Command Reference/GOTO
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GOTO label [fallback_label]
Continue macro execution at the label label. With the argument fallback_label a second label can be specified which is used as the target should the primary target, label, be undefined.
Often, the GOTO command is used with a variable label to implement a switch-like control structure. In this case, fallback_label has the role of the default switch clause.
If both label, and default_label, are undefined, an error is generated and macro execution terminates.
