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self._control_files.put(filename, my_file)
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@needs_write_lock # because merge pulls data into the branch.
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def merge_from_branch(self, branch, to_revision=None, from_revision=None):
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def merge_from_branch(self, branch, to_revision=None, from_revision=None,
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"""Merge from a branch into this working tree.
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:param branch: The branch to merge from.