Solved Tuple Class supported by Oxide?

So as the title says.. is Tuple Class supported by Oxide ? Because i'm using it for my plugin and its not working.
It says that i need reference or sth like that.

 

It is supported since .net 4.0 https://msdn.microsoft.com/en-us/library/system.tuple(v=vs.100).aspx.
Oxide uses 3.5

 

So Oxide will use 4.0 once Rust will change too >?

 

If Unity will move from mono or update it, they use still version 2.x of mono framework. You can also write your own Tuple class or port it from a newer framework source to your plugin...