Is there a way to get a use of

MutableCollection::plusAssign(Iterable)

to compile without having assignment operators ambiguity error? Here an example that does not compile:

val list = listOf(1, 2, 3)
	var mutableList = mutableListOf(4, 5, 6)
	mutableList += list

Only if you replace

var

with

val

If you need

var

there, than use addAll instead:

mutableList.addAll(list)

oh, yes I need var in my case, and now I understand what's up; thanks!

mutableList += list

is acutally reassign mutableList, but (mutableList + list) returns List, so type is not compatible, so it’s not clear how you can solve it