Dream Feature Regarding Default Arguments

[JN]

On Sunday, 6 April 2014 at 01:26:21 UTC, Nick Sabalausky wrote:
> Such a big mess for such a trivially simple API:
>
>     func( [optionalFoo], [optionalBar] )
>
> It would be *fantastic* if D recognized the disambiguation of 
> using incompatible types and permitted this:
>
>     interface Foo {}
>     interface Bar {}
>     class FooBar : Foo, Bar {}
>
>     void func(Foo foo=someFoo, Bar bar=someBar) {...}
>
>     func(myFoo); // Unambiguous, OK
>     func(myBar); // Unambiguous, OK
>     func(myFooBar); // Ambiguous, ERROR

Wouldn't it be better to have named parameters like in Python or
C#? That way you could call the function like:

func(foo=myFoo) or func(bar=myBar) or func(foo=myFoo, bar=myBar)
and there would be no ambiguity.