# File kwartz.rb, line 1933
        def normalize_assignment(setstmt_node)
            Kwartz::assert() unless setstmt_node.is_a?(SetStmtNode)
            assign_node = setstmt_node.left
            assign_op   = assign_node.token
            if assign_op != '='
                left  = assign_node.left
                right = assign_node.right
                op = assign_op.sub(/=$/, '')
                assign_node.token = '='
                assign_node.right = ExprNode.new(op, left, right)
            end
        end