Public Class B
  Public Function Bar (ByVal a As A) As Object
    Dim x as Integer = a.Foo(1, 2, 3)  ''' Should be resolved
  End Function
End Class

using System;
using System.Runtime.CompilerServices;

public class A
{
  [IndexerName("Foo")]
  public int this[int integer, int i, int integer1]
  {
    get { throw new NotImplementedException(); }
    set { throw new NotImplementedException(); }
  }
}