Struct initializer is inaccessible due to private protection level from its own file

It turns out that the “private access level” complaint was regarding the initializer, not the struct. The initializer’s access level is only as accessible as the least accessible instance variable.

If I make the string instance variable anything other than private, the error goes away:

private struct A {
  let string: String
  // synthesized initializer:
  // init(string: String)
}

So given that B can now read A‘s string, it can also access A‘s initializer.

If A had another private property though, then again its initializer would become private:

private struct A {
  let string: String
  private let int: Int
  // synthesized initializer:
  // private init(string: String, int: Int)
  ...
}