warn_unused _ result让编译器检查所有调用者是否都检查函数的结果。
Warn_unused_result forces the compiler to check that all callers check the result of the function.
如今，编译器会检查类型安全性，跟踪类型信息。
These days, compiler will take care of type safety and will track type information.
做编译器跳过检查移动以外的函数调用？
Does compilers move skip checks to outside the function call?
做编译器跳过检查移动以外的函数调用？
Does compilers move skip checks to outside the function call?
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