Will D ever get optional named parameters?

[Walter Bright via Digitalmars-d]

On 10/13/2014 7:23 AM, Ary Borenszweig wrote:
> On 10/13/14, 5:47 AM, Walter Bright wrote:
>> On 10/13/2014 1:29 AM, "岩倉 澪" wrote:
>>> Are there good reasons not to add something like this to the language,
>>> or is it
>>> simply a matter of doing the work? Has it been discussed much?
>>
>> Named parameters interact badly with overloading.
>
> Could you give an example?

Nothing requires function overloads to use the same names in the same order for 
parameters. "color" can be the name for parameter 1 in one overload and for 
parameter 3 in another and not be there at all for a third.

Parameters need not be named in D:

    int foo(long);
    int foo(ulong x);

Named parameters are often desired so that default arguments need not be in 
order at the end:

    int foo(int x = 5, int y);
    int foo(int y, int z);

To deal with all this, a number of arbitrary rules will have to be created. 
Overloading is already fairly complex, with the implemented notions of partial 
ordering. Even if this could all be settled, is it worth it? Can anyone write a 
document explaining this to people? Do people really want pages and pages of 
specification for this?