BEGIN {
    int indent = 1;
    string tab = "   ";
    string tree = "└╴";
    print("module\n");
}

enter declaration_list {
    indent += 1;
}
leave declaration_list {
    indent -= 1;
}

enter block {
    indent += 1;
}
leave block {
    indent -= 1;
}

enter function_item {
    print(tab * indent);
    print(tree);
    print("fn " + text(node.name) + "\n");
}

enter function_signature_item {
    print(tab * indent);
    print(tree);
    print("fn " + text(node.name) + "\n");
}

enter struct_item {
    print(tab * indent);
    print(tree);
    print("struct " + text(node.name) + "\n");
}

enter enum_item {
    print(tab * indent);
    print(tree);
    print("enum " + text(node.name) + "\n");
}

enter mod_item {
    print(tab * indent);
    print(tree);
    print("mod " + text(node.name) + "\n");
}

enter impl_item {
    print(tab * indent);
    print(tree);
    print("trait " + text(node.type) + "\n");
}