standard:warning/1

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Predicate warning/1

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warning(@Message) is det

Print a warning. The behaviour depends on the flag warning_action, which can be one of:

print_warning: Re-direct the message to SWI-Prolog's print_message
error_warning: Throw error(xsb_warning(Message), _)
silent_warning: Ignore the warning.

If Message is a list or comma-list, the elements are concatenated without a space.