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kotlinlang

in any event, implement it yourself
```
infix fun <http://Int.cat|Int.cat>(other: Int): Int = (toString() + other.toString()).toInt()
```

He meant `plus` lol which is revealed a short bit ago in their conversation <https://kotlinlang.slack.com/archives/C0922A726/p1543533094018100>

well, I thought he meant “plus”, but really he wanted some kinda wacky “concatenate and int-ify” function that cast ints to strings, concatenated them, then converted the string number to an `Int`

telling him to implement/overload `plus` would betray the notion of addition, so no point in calling it plus

(also you can’t really have an extension that overloads a member function with the exact same signature, the member function always wins. though technically it’d be shadowing and not overloading)

since he called it “concatenate”, I went with the *nix shortening of concatenate -&gt; `cat`