KtArrayAccessExpression(59,63): '1[2]'
  KaSymbolResolutionError:
    candidateSymbols = [
      /set(<extension receiver>: kotlin.Int, index: kotlin.Int, value: kotlin.Int): kotlin.Int
    ]
    diagnostic = ERROR<OPERATOR_MODIFIER_REQUIRED: 'operator' modifier is required on 'fun Int.set(index: Int, value: Int): Int'.>