safeAreaLayoutGuide is not accessible from visual format language

Originator:pirat267
Number:rdar://34933127 Date Originated:October 11 2017
Status:Open Resolved:Not yet
Product:UIKit Product Version:11.1
Classification:Suggestion Reproducible:
 
safeAreaLayoutGuide is currently only available via the UILayoutAnchor API introduced in iOS 9.
Apps that are also supporting iOS versions prior to iOS 9 often use the visual format language because it's very expressive. Unfortunately it's not possible to use the safeArea API there. 
I would like to see any possibility that changes this like adding a new symbol that represents the safeArea anchor instead of the superviews anchor. It could be an addition to | like <| for trailing/bottom-anchors.

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