exec_stmt ::= expr exprlist DUP_TOP EXEC_STMT
        exec_stmt ::= expr exprlist EXEC_STMT

def n_exec_stmt(self, node):
        """
        exec_stmt ::= expr exprlist DUP_TOP EXEC_STMT
        exec_stmt ::= expr exprlist EXEC_STMT
        """
        start = len(self.f.getvalue()) + len(self.indent)
        try:
            super(FragmentsWalker, self).n_exec_stmt(node)
        except GenericASTTraversalPruningException:
            pass
        self.set_pos_info(node, start, len(self.f.getvalue()))
        self.set_pos_info(node[-1], start, len(self.f.getvalue()))
        self.prune()