Why is `didSet` property observer called multiple times in this example with Swift 4.1, but only once with Swift 4.0?

[anthonylatsis]

Not surprised this happened, there is something going wrong with value type semantics right now. FYI

Bug or intended? "thing?.property = something" will trigger didSet observer even if thing is nil, but ONLY IF thing is a struct type

Try this: struct Thing { var property: Int = 0 } var optionalThing: Thing? { didSet { print("didSet") } } optionalThing?.property = 1 It will print "didSet" even though nothing was set, obviously. This does NOT happen if you change struct to class It's a little annoying because I want to set properties on things if they're not nil, and log a change when it happens. This behavior leads to superfluous log entries, or requires me to type if optionalThing != nil { optionalThing!.proper…

SR-7257
SR-7220

Time to update the bug list :)