docs.rs failed to build synctree-0.1.0
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use synctree::NodeArena;

let ref arena = NodeArena::with_capacity(12);
let root = tree!(
    arena,
    1 => [
        2,
        3 => [4, 5],
        6 => [
            7 => [8 => []],
            9 => [10 => [11]]],
        12
    ]
);