[Issue 24778] Warning for unused imports

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24778

basile-z <b2.temp at gmx.com> changed:

           What    |Removed                     |Added
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                 CC|                            |b2.temp at gmx.com

--- Comment #8 from basile-z <b2.temp at gmx.com> ---
RazvanN: I dont like how it's implemented.

I remember I already suggested that in a forum discussion but, let's do it
again:

If it's implemented in the compiler it would be better to implements this as a
"touched" system. You see when searching a symbol has worked and via an import,
you flag that import as "touched".

Then when the user asks for unused import you visit the tree and when it's an
import node and that import has not been touched you emit the warning.

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