On Friday, 21 December 2012 at 19:37:58 UTC, Jonathan M Davis wrote:
Not only are there perfectly legitimate uses for having used variables (e.g.
RAII) […]

Destructors with side effects could simply count as a "use" – problem solved.

[…] change
the semantics of programs (due to have it affects conditional compilation),

Warnings should not affect conditional compilation, even if the user has warnings as errors turned on. The whole difference of warnings compared to errors is that they are not part of the language.

David

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