python/moz/l10n/formats/mf2/message_parser.py [117:122]:
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                while sel_expr is not None and sel_expr.function is None:
                    if (
                        isinstance(sel_expr.arg, VariableRef)
                        and sel_expr.arg.name != sel_name
                    ):
                        sel_name = sel_expr.arg.name
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python/moz/l10n/formats/mf2/validate.py [64:69]:
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            while sel_expr is not None and sel_expr.function is None:
                if (
                    isinstance(sel_expr.arg, VariableRef)
                    and sel_expr.arg.name != sel_name
                ):
                    sel_name = sel_expr.arg.name
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