func verifiable<ReturnType >(property: String, file: StaticString , line: UInt) -> VerifiableProperty .Readable<ReturnType > Creates a
VerifiableProperty.Readable for property.func verifiable<ReturnType >(property: String, file: StaticString , line: UInt) -> VerifiableProperty .Writable<ReturnType > Creates a
VerifiableProperty.Writable for property.