Sets the 404 property and saves whether query is feed.

Source

public function set_404() {
	$is_feed = $this->is_feed;

	$this->init_query_flags();
	$this->is_404 = true;

	$this->is_feed = $is_feed;

	/**
	 * Fires after a 404 is triggered.
	 *
	 * @since 5.5.0
	 *
	 * @param WP_Query $query The WP_Query instance (passed by reference).
	 */
	do_action_ref_array( 'set_404', array( $this ) );
}

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Hooks

do_action_ref_array( ‘set_404’, WP_Query $query )

Fires after a 404 is triggered.

Changelog