Comment by Asooka

We use 4-wide tabs and in our code style it would be

    some_func(
        verylongarg0,
        verylongarg1
    );

Which I feel is the most readable option. If you have to break the args into a vertical list, you want to use the least amount of whitespace before each arg. It's also a bit easier to read with every term starting at a tab break.