Documentation for listop ???

Documentation for listop ???, assembled from the following types:

language documentation Operators

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(Operators) listop ???

Admonitory stub operator.

If it's the only statement in a routine or type, it marks that routine or type as a stub (which is significant in the context of pre-declaring types and composing roles).

If the ??? statement is executed, it calls warn, with the default message stub code executed.