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kotlinlang

Can someone explain why this works?
```fun listOfArrays(): List&lt;Array&lt;Any&gt;&gt; {
  return listOf(arrayOf("1", 0))
}```
But not this?
```fun listOfArrays(): List&lt;Array&lt;Any&gt;&gt; {
  // Type mismatch: inferred type is List&lt;Array&lt;out {Comparable&lt;*&gt; &amp; java.io.Serializable}&gt;&gt; but List&lt;Array&lt;Any&gt;&gt; was expected
  return listOf(arrayOf("1", 0)).map { it }
}```

Probably a type inference bug that is worth reporting on <http://kotl.in/issue|kotl.in/issue> if it's reproducible in 1.4.20-M1.

It's with `1.4.10` , I'll try `1.4.20-M1`  :thumbsup:

My initial sample was wrong, it missed a layer of `List&lt;&gt;` . I just updated it but that doesn't change the issue. I filed <https://youtrack.jetbrains.com/issue/KT-42586>

This looks a lot like the issue that caused plsusElement to be added

plus has some very weird behavior for lists of lists

<https://youtrack.jetbrains.com/issue/KT-9992#focus=Comments-27-1283874.0-0|https://youtrack.jetbrains.com/issue/KT-9992#focus=Comments-27-1283874.0-0>

No, it isn't related to KT-9992. Most likely it's the same problem as <https://youtrack.jetbrains.com/issue/KT-17115>, where compiler is unable to infer types in a chain of method calls.