I put this here because it's probably a flawed idea. A 'learn' level suggestion.

At present function arguments that you want to default must go at the end like so:

int fun(int a = 1, int b = 2, int c = 3)
{
    return a + b + c;
}

fun(4); //Modifies a

where the default fields can only be fields after any argument provided. Why not allow something like:

fun( , 4, ); //Modifies b
fun( , , 5); //Modifies c

for when you want to call fun with other fields not being default? This would seem more flexible and pretty clear what is intended.

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