不用再检查默认的复合值，您也可以捕获对未定义变量的访问。
Instead of checking for a default compound value, you can also catch the access to an undefined variable. E.g.
它只保存一段数据：一个字符串、一个数字、未定义的值以及对另一个变量的引用。
They hold only one piece of data: a string, a number, the undefined value, a reference to another variable.
如果代码的改变在被重构的方法内部引发了问题——变量未定义，或者类型不匹配——重构操作将对这些问题进行标记。
If the changes cause problems in the method being refactored — because it leaves undefined variables or mismatched types — the refactoring operations will flag these.
如果看一下DebugMessages面板，答案就清楚了：变量 $multipler是未定义的，因为它是一个拼写错误，应该是 $multiplier。
If you look at the Debug Messages pane, the answer is spelled out: The variable $multipler is undefined because it's a typo. It should be $multiplier.
你的代码包括一些未定义的变量，你作为已经定义并初始化的来使用。
Your code includes some undefined variable that you have used as if it was already defined and initialized.
已注册但未定义的变量被标记为未定义。
Registered variables which are undefined are marked as being not defined.
说明：在REXX未定义的主机变量。
对于应该从脚本中出现的变量和函数，有大量未定义的变量错误，但除此之外，没有错误。
There are plenty of Undefined Variable errors for variables and functions that should be present from the script, but other than that, no errors.
设置一个指针变量导致未定义的行为。
这就意味着在到达常数声明语句前局部常数值是未定义的，在函数中分配变量前局部变量是未定义的。
This means that the value of a local constant is undefined until the constant declaration statement is reached and that a local variable is undefined until the variable is assigned to in the function.
未定义的函数或变量' sqt '。
未定义的函数或变量' sqt '。
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