swift-mirror/test/Serialization/Inputs/struct_with_operators.swift

public struct SpecialInt {
  public var value = 0
  public init() {}
}

operator prefix +++ {}
operator postfix +++ {}

@prefix public func +++(inout base: SpecialInt) {
  base.value += 2
}

@postfix public func +++(inout base: SpecialInt) {
  println("use the prefix form instead")
}