digraph F {
    rankdir = BT;

    subgraph cluster_0 {
        label = "btrfs";
        labeljust = "l";
        style = dotted;
        definitions -> structs;
        fs;
    }
    
    subgraph cluster_1 {
        label = "lang";
        labeljust = "l";
        style = dotted;
        variables -> definitions;
        structs;
    }
    
    subgraph cluster_2 {
        label = "lang";
        labeljust = "l";
        style = dotted;
        semantics -> variables;
        eval -> definitions;
        eval -> fs;
        eval -> variables;
        eval -> structs;
        parse;
    }

    subgraph cluster_3 {
        label = "lang";
        labeljust = "l";
        style = dotted;
        runtime -> parse;
        runtime -> semantics;
        runtime -> eval;
    }
}