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Is this type inference bug?  `list` is `MutableList&lt;Bucket&gt;`

No, it means `list` is a `var`, so it's ambiguous if it should be interpreted as `list = list.plus(bucket)` or `list.plusAsign(bucket)`

<https://kotlinlang.org/docs/reference/operator-overloading.html#assignments>
&gt; If the corresponding binary function (i.e. plus() for plusAssign()) is available too, report error (ambiguity)

thanks, I wasn't aware of special rules for `+=` operator