Function rustc_mir::dataflow::framework::graphviz::write_diff

fn write_diff<A: Analysis<'tcx>, 'tcx>(
    w: &mut impl Write, 
    analysis: &A, 
    from: &BitSet<A::Idx>, 
    to: &BitSet<A::Idx>
) -> Result<()>

Writes two lines, one containing the added bits and one the removed bits.