Kotlin 2.0.20 bug found

1

I ran into a problem in 2.0.20 that I can not reproduce in 1.9.0, 1.9.10, 1.9.20 or 2.0.0

The following code won’t compile due to accessing the var “list”

class GenericClass {
@PublishedApi internal var list = mutableListOf()

companion object {
inline fun GenericClass.init() {
list = mutableListOf() // compiler error accessing list, only fails for setting, not getting
}
}
}

This appears to be specific to generic classes, this same code without the generic type compiles.

Thoughts? Am reporting to the right place?

2

The correct place to report bugs is https://kotl.in/issue

3

Also, I can’t reproduce your problem. How do you call this init function? Could you write it in https://play.kotlinlang.org/?

4

I can post a project, I don’t call it at all, this doesn’t compile when building with 2.0.20, but it builds with 1.9 and 2.0.0

5

It doesn’t look like your sample code would ever compile, because you’re not providing a type parameter to mutableListOf. How does the compiler know what the type of internal var list is? Right now it’d just be List with no type.

6

There seems to be a formatting problem due to angle brackets <>. I was able to get the original text of the post using Discourse’s raw API, but OP, please use code formatting using triple backticks ``` next time

class GenericClass<T> {
  @PublishedApi internal var list = mutableListOf<String>()

  companion object {
    inline fun <reified T : Any> GenericClass<T>.init() {
      list = mutableListOf() // compiler error accessing list, only fails for setting, not getting
    }
  }
}

I can’t seem to reproduce the compiler error though, at least on 2.0.21

1 Like
7

I just verified that is doesn’t occur in 2.0.21, just in 2.0.20 so you can consider this fixed.