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merge from integration.

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        files within them.
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    """
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    old_tree.lock_read()
 
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    try:
 
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        new_tree.lock_read()
 
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        try:
 
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            return _compare_trees(old_tree, new_tree, want_unchanged,
 
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                                  specific_files)
 
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        finally:
 
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            new_tree.unlock()
 
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    finally:
 
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        old_tree.unlock()
 
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def _compare_trees(old_tree, new_tree, want_unchanged, specific_files):
 
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    from osutils import is_inside_any
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    old_inv = old_tree.inventory