Classes
ExpressionBoundsBeforeChildDispatcher()
ExpressionBoundsBeforeChildDispatcher
ExpressionBoundsExitNodeDispatcher(*args, ...)
ExpressionBoundsExitNodeDispatcher
ExpressionBoundsVisitor([leaf_bounds, ...])
ExpressionBoundsVisitor
Walker 用于从叶节点到根节点计算表达式的边界,并缓存终端节点的边界(变量和表达式)