KtCallExpression(52,57): 'foo()'
  KaApplicableCallCandidate:
    candidate = KaSimpleFunctionCall:
      contextArgumentMapping = {}
      contextArguments = []
      dispatchReceiver = null
      extensionReceiver = KaSmartCastedReceiverValue:
        original = KaExplicitReceiverValue:
          expression = a
          isSafeNavigation = false
          type = kotlin.Any
        type = kotlin.String
      signature = KaFunctionSignature:
        receiverType = kotlin.String
        returnType = kotlin.Unit
        symbol = /foo(<extension receiver>: kotlin.String): kotlin.Unit
        valueParameters = []
        contextParameters = []
        callableId = /foo
      typeArgumentsMapping = {}
      valueArgumentMapping = {}
    isInBestCandidates = true