import rx._
val a = Var(1)
val b = Var(2)
val c = Rx{ a() + b() }

This Rx might leak! Either explicitly mark it unsafe (Rx.unsafe) or ensure an implicit RxCtx is in scope!
[error]     val c = Rx{ a() + b() }
[error]               ^
[error] one error found

scala> import rx._
val a = Var(1)
val b = Var(2)
val c = Rx{ a() + b() }
import rx._

scala> a: rx.Var[Int] = Var@2c(1)
scala> b: rx.Var[Int] = Var@2f(2)
scala> c: rx.Rx.Dynamic[Int] = Rx@d1(3)
scala>