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< setDrainState(Drainable::Drained);
---
> setDrainState(DrainState::Drained);
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< assert(getDrainState() == Drainable::Drained ||
< getDrainState() == Drainable::Running);
---
> assert(getDrainState() == DrainState::Drained ||
> getDrainState() == DrainState::Running);
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< setDrainState(Drainable::Running);
---
> setDrainState(DrainState::Running);