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If it's truly unreachable then it's not likely to be a problem. If it is reachable and it's emerging from some macros and templates then I would be more inclined want a warning for it.

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Yeah, but then you need compiler to somehow know if it's truly unreachable to know when to emit the warning and when to not do that.

If it's a warning and not an error then emit it whether it's unreachable or not

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