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diff

Function diff 

Source
pub fn diff(
    old: &dyn Source,
    new: &dyn Source,
    sink: &mut dyn ChangeSink,
) -> Result<DiffStats, Refusal>
Expand description

The difference between two opened workbooks, in either format, to the sink in the fixed order; what was counted comes back. A refusal from either file’s walk ends the comparison, the rows before it standing.