id: prefer-iterator-sum
valid:
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let total = items.iter().sum::<i32>();
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let total = items.iter().fold(1, |acc, x| acc * x);
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let total = items.iter().fold(0, |acc, x| acc + x + 1);
invalid:
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let total = items.iter().fold(0, |acc, x| acc + x);
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let total = items.iter().fold(0.0, |acc, x| acc + x);
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let total = items.iter().fold(0u64, |acc, x| acc + x);