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_raise_if_nonexistent(specific_files, old, new)
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changes = new._iter_changes(old, show_unchanged, specific_files,
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reporter = _mod_delta._ChangeReporter(output_file=to_file,
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unversioned_filter=new.is_ignored)
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_mod_delta.report_changes(changes, reporter)
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delta = new.changes_from(old, want_unchanged=show_unchanged,
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specific_files=specific_files,
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# filter out unknown files. We may want a tree method for
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delta.unversioned = [unversioned for unversioned in