KtArrayAccessExpression(44,48): '1[2]'
  KaCallResolutionError:
    candidateCalls = [
      KaSimpleFunctionCall:
        contextArgumentMapping = {}
        contextArguments = []
        dispatchReceiver = null
        extensionReceiver = KaExplicitReceiverValue:
          expression = 1
          isSafeNavigation = false
          type = kotlin.Int
        signature = KaFunctionSignature:
          receiverType = kotlin.Int
          returnType = kotlin.Int
          symbol = /get(<extension receiver>: kotlin.Int, index: kotlin.Int): kotlin.Int
          valueParameters = [
            KaVariableSignature:
              name = index
              receiverType = null
              returnType = kotlin.Int
              symbol = index: kotlin.Int
              contextParameters = []
              callableId = null
          ]
          contextParameters = []
          callableId = /get
        typeArgumentsMapping = {}
        valueArgumentMapping = {
          2 -> (KaVariableSignature:
            name = index
            receiverType = null
            returnType = kotlin.Int
            symbol = index: kotlin.Int
            contextParameters = []
            callableId = null)
        }
    ]
    diagnostic = ERROR<OPERATOR_MODIFIER_REQUIRED: 'operator' modifier is required on 'fun Int.get(index: Int): Int'.>