---
source: hydroflow/tests/surface_fold.rs
expression: "df.meta_graph().unwrap().to_dot(& Default :: default())"
---
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    n2v1 [label="(n2v1) fold::<\l    'tick,\l>(\l    || 0,\l    |old: &mut usize, _: usize| {\l        *old += 1;\l    },\l)\l", shape=invhouse, fillcolor="#88aaff"]
    n3v1 [label="(n3v1) tee()", shape=house, fillcolor="#ffff88"]
    n4v1 [label="(n4v1) for_each(|_| {})", shape=house, fillcolor="#ffff88"]
    n5v1 [label="(n5v1) source_stream(items_recv)", shape=invhouse, fillcolor="#88aaff"]
    n6v1 [label="(n6v1) cross_join_multiset()", shape=invhouse, fillcolor="#88aaff"]
    n7v1 [label="(n7v1) for_each(|v| result_send.send(v).unwrap())", shape=house, fillcolor="#ffff88"]
    n8v1 [label="(n8v1) handoff", shape=parallelogram, fillcolor="#ddddff"]
    n9v1 [label="(n9v1) handoff", shape=parallelogram, fillcolor="#ddddff"]
    n10v1 [label="(n10v1) handoff", shape=parallelogram, fillcolor="#ddddff"]
    n2v1 -> n3v1
    n1v1 -> n8v1
    n3v1 -> n4v1
    n3v1 -> n9v1
    n5v1 -> n10v1
    n6v1 -> n7v1
    n8v1 -> n2v1 [color=red]
    n9v1 -> n6v1 [label="1"]
    n10v1 -> n6v1 [label="0"]
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        n7v1
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    subgraph "cluster n4v1" {
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        label = "sg_4v1\nstratum 0"
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