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kotlinlang

Hi guys, got a question about `PreconditionsKt.checkNotNull()`:
Is that ok that after `checkNotNull()` compiler still thinks that the `value` can be null? 
```
class TargetClass(private val value: String? = null) {
    fun functionThatUsesValue() {
        checkNotNull(value)

        // Still need to add ?. to the value call
        println("split: ${value?.split(" ")}")
    }
}

fun main(args: Array&lt;String&gt;) {
    val target = TargetClass()
    target.functionThatUsesValue()
}
```

Hey, you could in fact do this:
```
val nonNull = checkNotNull(value)
// use `nonNull` here freely
```