Re: Do interfaces make sense in multiple dispatch languages?

> the diamond problem for interfaces exists in Nice.

like this?
     void main(String [] args) {
         let it = new InterfaceBottom();
         println( interfaceFoo(it) ); 
     }

Ambiguity for symbol interfaceFoo. Possibilities are :
nice.lang.int interfaceFoo(InterfaceRight t)
nice.lang.int interfaceFoo(InterfaceLeft t)

(Same as with Scala's Traits)


> the concept of interface can be replaced in Nice without introducing
> any ill effects from a language semantics viewpoint

Shouldn't we ask what we expect the benefits of multiple inheritance to
be? To quote from that JavaWorld article 
http://www.javaworld.com/javaworld/jw-12-1998/jw-12-techniques_p.html

"I spent five years programming in C++, and in all that time I had
never once used multiple inheritance. Multiple inheritance wasn't
against my religion exactly, I just never encountered a C++ design
situation where I felt it made sense. When I started working with Java,
what first jumped out at me about interfaces was how often they were
useful to me."



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