For all those struggling with this, I found the fix. Make sure Swift Tools Version is 5.9 at the top of your package.swift file:
// swift-tools-version: 5.9
// The swift-tools-version declares the minimum version of Swift required to build this package.
Then you're allowed to specify iOS 17 in your platforms declaration:
platforms: [.iOS(.v17)],
publicfarley
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Hey @cyclic. Did you solve your issue? Unfortunately, when I try to use @Observable in a Swift Package I get the following error: "'ObservationRegistrar' is only available in iOS 17.0 or newer".
You?