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from bzrlib.branch import Branch
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from bzrlib.workingtree import WorkingTree
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from errors import (DifferentBranchesError, NotBranchError, PermissionDenied,
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from errors import (DifferentBranchesError, NotBranchError, PrefixFormatError,
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def diff(revision=None, file_list=None, diff_options=None, prefix=None):
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""" Save the diff into a temporary file.