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

[Clay Smith]

bearophile wrote:
> Clay Smith:
> 
>> I would like my all.d files to not give errors :o<
> 
> "all.d" files are a hack used to patch one of the minor holes of the current D module system. The right way to do that is with a syntax like (that must not import the 'foo' name too in the current namespace, only the names inside "std.foo"):
> 
> import std.foo: *;
> 
> Every part of a language needs to be designed with care. Approximate designs with several holes aren't enough.
> 
> Bye,
> bearophile

That would be a nice feature.