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Have you ever seen a bug caused by this? I haven't. At least anecdotally, this is purely stylistic, and has no impact outside of personal preference.

With one caveat: Heavy constructor/destructor use requires it.

Yes. I have absolutely seen bugs caused by the wrong variables being assigned to. I've seen it especially with loop variables. jaegerpicker indicates that he's also caused bugs by assigning to the wrong variables.

Not sure what you mean about "heavy constructor/destructor use" requiring this style.

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