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kotlinlang

Having a question with respect to using the `?:` elvis operator to provide a default:
If I have reasonable tests around code that does something like:
```
    val x = nullableObject?.method() ?: default
```
JaCoCo tells me I have one of 4 branches uncovered.
If I change that to:
```
    val nullableX = nullableObject?.method()
    val x = nullableX ?: default
```
JaCoCo tells me all branches are covered (2 branches per line).
I'm guessing the "uncovered" branch is when `nullableObject` is non-null, but `method()` returns null -- is there a way to get JaCoCo to realize that branch is not possible based on `method()` not being nullable?  Or is there a better practice here?

Hold on. It is actually inefficient in Kotlin JVM BE. I’ll report it.

<https://youtrack.jetbrains.com/issue/KT-32744>