KtOperationReferenceExpression(54,56): '+='
  isImplicitReferenceToCompanion: false
  contextSensitiveResolutionStatus: NotAvailable
  lookupLocally: false
  KaSymbolResolutionSuccess:
    symbols = [
      kotlin/collections/plusAssign(<extension receiver>: kotlin.collections.MutableCollection<in T>, element: T): kotlin.Unit
    ]
