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Starting with the very basic, 3 + 4 = 7. The data is 3 and 4. The operation is +.，更多细节参见PDF资料
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No exceptions. Error handling uses Result and the ? propagation operator (see Chapter 10). Errors are values, not control flow. Every function that can fail says so in its return type, and the compiler enforces that you handle the error or propagate it.