How about Go's... error on unused imports?

[Walter Bright]

Andrei Alexandrescu wrote:
> I think this is an environment issue. I like Eclipse's approach. Java 
> unnecessary imports are underlined with a wavy red line.

I agree. I would find it very annoying to have to remove unused imports 
to get it to compiler. First off, I tend to have "all" imports that 
import everything. Secondly, what if I version out some code, wouldn't 
want to version the import too.