func verifiable<ReturnType >(ParameterType ..., function: String, file: StaticString , line: UInt) -> VerifiableSubscript .Readable<ReturnType > Creates a
VerifiableSubscript.Readable for a subscript.func verifiable<ReturnType >(ParameterType ..., function: String, file: StaticString , line: UInt) -> VerifiableSubscript .Writable<ReturnType > Creates a
VerifiableSubscript.Writable for a subscript.