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annotate.annotate_file_tree(revtree_1, 'a',
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to_file=to_file, branch=tree1.branch)
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to_file = codecs.getwriter('ascii')(sio, 'replace')
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annotate.annotate_file_tree(revtree_2, 'b',
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to_file=to_file, branch=tree1.branch)
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# test now with unicode file-like
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to_file = StringIOWithEncoding()