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No, postfix increment returns an rvalue, so it can’t be applied twice. (jk)

Ah of course. So name it instead C+=2

Looks like you could have (++C)++

If the idea is to remove old & deprecated features from C++ that would be (C++)—-

You can't do that because of the rvalue problem I mentioned above. Only (++C)-- and (--C)++ are allowed!