Give three examples of features that are not provided in some language with which you are familiar, but that are common in other languages. Why do you think these features are missing? Would they...

Give three examples of features that are not provided in some language with which you are familiar, but that are common in other languages. Why do you think these features are missing? Would they complicate the implementation of the language? If so, would the complication (in your judgment) be justified?