dlang - validate input matches enum member name

test.d

void main()
{
    static immutable pairs = [__traits(allMembers, Pair)];

    pragma (msg, pairs); // ["EURUSD", "GBPUSD", "USDCHF", "XAUUSD"]

    import std.stdio : writeln;
    "EURUSD".parseEnum!Pair.writeln;
    "GBPUSD".parseEnum!Pair.writeln;
    "USDCHF".parseEnum!Pair.writeln;
    "XAUUSD".parseEnum!Pair.writeln;
    "asd".parseEnum!Pair.writeln;
}

enum Pair
{
    EURUSD,
    GBPUSD,
    USDCHF,
    XAUUSD,
}

E parseEnum(E)(string input)
if (is(E == enum))
{
    switch (input)
    {
        static foreach (member; __traits(allMembers, E))
            case member:
                return mixin("E.", member);
        default:
            // Replace with whatever other error-handling mechanism you want:
        throw new Exception("Can't parse enum `" ~ E.stringof ~ q"{` - input: "}" ~ input ~ `".`);
    }
}