Survey: what new bit of syntax would you like in base #RStats?

What should the following bits of syntax do?

* ===
* ++ And --
* +=
* //
* ?
* {{ }}
* [[[ ]]]
* <<==
* (?: X)

@coolbutuseless
++ Increment
-- decrement

Btw some of these do exist, in the tidyverse for example curly curly {{ }} calls entities within functions. Or are you talking about base R?