error unoirdered map ctor

enum class ArgumentType {
    In,
    Out,
};

const ArgumentType kMovInstruction[] = { ArgumentType::In, ArgumentType::Out };
const ArgumentType kLdrInstruction[] = { ArgumentType::In, ArgumentType::Out };
const ArgumentType kStrInstruction[] = { ArgumentType::In, ArgumentType::In };
const ArgumentType kAddInstruction[] = { ArgumentType::In, ArgumentType::In, ArgumentType::Out };
const ArgumentType kSubInstruction[] = { ArgumentType::In, ArgumentType::In, ArgumentType::Out };
const ArgumentType kMulInstruction[] = { ArgumentType::In, ArgumentType::In, ArgumentType::Out };
const ArgumentType kDivInstruction[] = { ArgumentType::In, ArgumentType::In, ArgumentType::Out };
const ArgumentType kNoopInstruction[] = {};
const ArgumentType kHaltInstruction[] = {};

const std::unordered_map<std::string_view, std::span<ArgumentType>> kInstructionLookup{
    { "mov"sv, kMovInstruction },
    { "ldr"sv, kLdrInstruction },
    { "str"sv, kStrInstruction },
    { "add"sv, kAddInstruction },
    { "sub"sv, kSubInstruction },
    { "mul"sv, kMulInstruction },
    { "div"sv, kDivInstruction },
    { "noop"sv, kNoopInstruction },
    { "halt"sv, kHaltInstruction },
};