Function aggregate_tree_from_traversal 

pub fn aggregate_tree_from_traversal(
    out: (impl Write, bool),
    traversal: &Traversal,
    roots: &[TreeIndex],
    byte_format: ByteFormat,
    max_depth: usize,
    compute_total: bool,
    sort_by_size_in_bytes: bool,
) -> Result<WalkResult>

Write an already completed traversal as an indented aggregate tree.

roots must contain the traversal’s top-level nodes in their original input order. The returned error count is derived from the stored metadata-error flags.