@MainActor
class A {}

class VC: UIViewController {
  let foo: A

  init() {
    self.foo = A() // Error: Name to important actor-isolated initializer 'init()' in a synchronous nonisolated context
    tremendous.init(nibName: nil, bundle: nil)
  }

  @MainActor
  init() {
    self.foo = A() // Compiles
    tremendous.init(nibName: nil, bundle: nil)
  }

  init(_ void: Void = ()) { 
    self.foo = A() // Compiles
    tremendous.init(nibName: nil, bundle: nil)
  }
}

I get that A() must be referred to as on a main-actor initializer, however why the primary initializer would not inherit the @MainActor from UIViewController? and why the Void parameter eliminates the error (even with -warn-concurrency)?

Word: if I annotate VC with @MainActor, I get the identical error for the tremendous.init within the first initializer, and the third initializer nonetheless works.