is there a way to resolve an ambiguous += to a list? `cliOptions += CliOption()` clioptions is a jav...

# stdlib

[sreich]

is there a way to resolve an ambiguous += to a list?
cliOptions += CliOption()
clioptions is a java List

Assignment operators ambiguity. All these functions match.
public operator fun <T> Collection<CliOption!>.plus(element: CliOption!): List<CliOption!> defined in kotlin.collections
public inline operator fun <T> MutableCollection<in CliOption>.plusAssign(element: CliOption): Unit defined in kotlin.collections

[Joffrey]

You could do cliOptions.add(CliOption()) or cliOptions = cliOptions + CliOption() depending on the one you want

[ephemient]

not always but often var : MutableList is a poor design choice anyway

[sreich]

@Joffrey why do i have to do = + ? this doesn't really answer why += doesn't work, and why i have to explicitly call assignPlus()

[sreich]

which sucks because they're all noisier than just doing +=

[ephemient]

.plusAssign and = .plus are the respective meanings of += with val cliOptions: MutableList and var cliOptions: List respectively. but if you have a var cliOptions: MutableList then += is ambiguous