init_error.swift

struct S1 {
  var stored: UInt?

  init(_ x: UInt) {
    if x > 42 {
      self.init(_big: x)
      return
    }
    self.stored = x // <--- error: 'self' used before 'self.init' call or assignment to 'self'
  }

  init(_big x: UInt) {
    self.stored = x
  }
}

struct S2 {
  var stored: UInt?

  init(_ x: UInt) {
    if x > 42 {
      self.init(_big: x)
      return
    }
    self.init(_small: x)
  }

  init(_big x: UInt) {
    self.stored = x
  }

  init(_small x: UInt) {
    self.stored = x
  }
}