out parameter in while loop

[FaustVX]

In this method, the output parameter needs to be defined outside the while loop.

public static T Ask<T>(string prompt, TryConvert<T> converter)
{
    T output;
    do
    {
        Console.Write(prompt + ":");
    } while (!(Console.ReadLine() is string read && converter(read, out output)));
    return output;
}

It would be nice to have the out var functionality extended to the while condition and access the parameter after the loop,
Like that:

public static T Ask<T>(string prompt, TryConvert<T> converter)
{
    do
    {
        Console.Write(prompt + ":");
    } while (!(Console.ReadLine() is string read && converter(read, out var output)));
    return output;
}

[HaloFour]

See: https://github.com/dotnet/csharplang/blob/main/meetings/2016/LDM-2016-11-30.md#scope-of-while-condition-expression-variables

[FaustVX]

Ok, it would be nice, but I understand why it can't be that way.