Jacob Carlborg:
I don't think it adds much complexity. If you don't use extern (Objective-C) you don't need to learn it.
D books must be bigger, D programmers must read those parts of the books, the error messages become more complex (because you can hit by mistake the unwanted syntax, or because the compiler recovering of errors must consider more possibilities), the compiler gets a little larger. Thinking that some new syntax has no costs is very wrong.
Bye, bearophile
