private vs protected in Interfaces

[Christian Kamm]

Andrej Mitrovic wrote:

> TPDL, page 216: "Making an overridable function private in an
> interface..prevents an implementation from calling the super function".
> 
> But the code example above compiles and runs fine.
> 

See http://d.puremagic.com/issues/show_bug.cgi?id=4542 .

By the D spec, private implies final. That means unimplemented private 
methods in interfaces have little use. Also 'private override' should be an 
error.

Or spec and compiler should be changed to be in line with TDPL.

Christian