unowned(safe) and unowned(unsafe) are undocumented

Originator:jgallagher
Number:rdar://17157380 Date Originated:6/4/2014
Status:Open Resolved:
Product:Documentation Product Version:
Classification:Open Reproducible:
 
The Swift book's Language Reference section includes "unowned(safe)" and "unowned(unsafe)" in the grammar, but these are not documented anywhere that I can find.

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