KT element: KtCallExpression
FIR element: FirFunctionCallImpl
FIR source kind: KtRealSourceElementKind

FIR element rendered:
R|kotlin/collections/mutableListOf|<R|kotlin/String|>()

FIR FILE:
FILE: [ResolvedTo(IMPORTS)] insidePlusAssignTarget.kt
    public final [ResolvedTo(BODY_RESOLVE)] fun foo([ResolvedTo(BODY_RESOLVE)] x: R|kotlin/collections/MutableMap<kotlin/Int, kotlin/collections/MutableList<kotlin/String>>|): R|kotlin/Unit| {
        R|<local>/x|.R|kotlin/collections/getOrPut|<R|kotlin/Int|, R|kotlin/collections/MutableList<kotlin/String>|>(Int(1), <L> = [ResolvedTo(BODY_RESOLVE)] [MatchingParameterFunctionTypeKey=kotlin/Function0<V>] getOrPut@fun <anonymous>(): R|kotlin/collections/MutableList<kotlin/String>| <inline=Inline, kind=UNKNOWN>  {
            ^ R|kotlin/collections/mutableListOf|<R|kotlin/String|>()
        }
        ).R|kotlin/collections/plusAssign|<R|kotlin/String|>(String(str))
    }