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< DrainState drain() M5_ATTR_OVERRIDE;
---
> DrainState drain() override;
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< void serialize(CheckpointOut &cp) const M5_ATTR_OVERRIDE;
< void unserialize(CheckpointIn &cp) M5_ATTR_OVERRIDE;
---
> void serialize(CheckpointOut &cp) const override;
> void unserialize(CheckpointIn &cp) override;