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Issue Description:

Using the Time library, I've run into a compiler issue with SwiftUI and @State with initialization of View objects:

struct Failure: View {
  @State
  private var offset: CGFloat
  private let clockChime: ClockChime<Minute>

  var body: some View { /* */ }

  init() {
    self.offset = 0 // compiler error: self used before it is fully initialized
    self.clockChime = Clocks.system.chime(every: .minutes(1))
  }
}

This only occurs when using the ClockChime type - if it's replaced with plain Swift types such as Bool or String it compiles just fine.

It also compiles just fine if the @State property definition is default initialized and ignored in the initializer

@State
private var offset: CGFloat = 0