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bzrlib/diff.py
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    The more general form is show_diff_trees(), where the caller
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    supplies any two trees.
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    """
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    output = sys.stdout
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    def spec_tree(spec):
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        revision_id = spec.in_store(tree.branch).rev_id
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        return tree.branch.repository.revision_tree(revision_id)
 
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        if tree:
 
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            revision = spec.in_store(tree.branch)
 
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        else:
 
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            revision = spec.in_store(None)
 
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        revision_id = revision.rev_id
 
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        branch = revision.branch
 
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        return branch.repository.revision_tree(revision_id)
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    if old_revision_spec is None:
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        old_tree = tree.basis_tree()
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    else: