#### ClusterSpannerBeacon

ClusterSpannerBeacon objects are created by: Cluster_spanner_engraver

Standard settings:

`print-function` (procedure):
  `#f`

  Function taking grob as argument, returning a `Stencil` object.

`Y-extent-callback` (procedure):
  `Cluster_beacon::height`

  see `X-extent-callback`.

This object supports the following interfaces: item-interface, cluster-beacon-interface and grob-interface

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