Rule to detect not handled Left which is not wrapped into either {}

[nacyolsa]

Let say I have a function:

fun doSomething(): Either<CustomError, Unit> = ...

and

fun doWithoutEither() {
    doSomething()
}

What do you think about adding a rule which will detect functions which return Either<Left, Right> but are called not inside either{} or their left side is not handled?