ASSIGN_OP 中的模式匹配任何标准的赋值运算符：=、+=、-=、*=，等等，但是注意不要匹配其他包含 = 的运算符，比如 == 和 =~。

The pattern in ASSIGN_OP matches any of the standard assignment operators: =, +=, -=, *=, etc. but carefully avoids matching other operators that contain =, such as == and =~.

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例如，可以使用一个模式匹配同时为两个变量赋值(参见清单31)。

For example, we can assign values to two variables simultaneously with one pattern matching (see Listing 31).

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为变量赋值实际上就是一种特殊的模式匹配。

Assigning values to variables is actually a special type of pattern matching.

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