Warn on unused imports?

[FeepingCreature]

On Wednesday, 26 September 2018 at 01:13:11 UTC, Jonathan M Davis 
wrote:
> IMHO, the only time that anything along the lines of a warning 
> makes sense is when the programmer is proactively running a 
> tool to specifically ask to be informed of a potential type of 
> problem where they will then go look at each of them 
> individually and decide whether what the tool is telling them 
> is valid or not - at which point, some of what the tool says 
> will be followed, and some if it will be ignored.

> - Jonathan M Davis

Yeah, that's exactly how I ended up doing it, as an additional 
part of the -deps info. See 
https://github.com/dlang/dmd/pull/8740 .