KtCallableReferenceExpression(72,80): 'obj::foo'
  KaApplicableCallCandidate:
    candidate = KaCallableReferenceCall:
      contextArguments = []
      dispatchReceiver = null
      extensionReceiver = KaExplicitReceiverValue:
        expression = obj
        isSafeNavigation = false
        type = Foo
      signature = KaFunctionSignature:
        receiverType = Foo
        returnType = kotlin.Unit
        symbol = /foo(<extension receiver>: Foo, a: kotlin.Int): kotlin.Unit
        valueParameters = [
          KaVariableSignature:
            name = a
            receiverType = null
            returnType = kotlin.Int
            symbol = a: kotlin.Int
            contextParameters = []
            callableId = null
        ]
        contextParameters = []
        callableId = /foo
      typeArgumentsMapping = {}
    isInBestCandidates = true