Does NSToolbarItem.Identifier.sidebarSeperator exist

I can't manage to get a NSToolbarItem placed in the sidebar. And I can't use NSToolbarItem.Identifier.sidebarSeperator as stated in the WWDC video because it isn't there.

Code Block swift
toolbarItem = NSTrackingSeparatorToolbarItem(identifier: .sidebarTrackingSeparatorItemIdentifier, splitView: splitVC.splitView, dividerIndex: 0)

I'm trying to use sidebarTrackingSeparatorItemIdentifier as well. No lucks w/o the other.

Does NSToolbarItem.Identifier.sidebarSeperator exist
 
 
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