$ cat test.java
interface I1 { int getP (); }
interface I2 { int getP (); }
interface I3 extends I1, I2 {}

class C
{
	static int M ()
	{
		I3 o = null;
		return o.getP ();
	}
}

$ cat test.cs
public interface I1 { int GetP (); }
public interface I2 { int GetP (); }
public interface I3 : I1, I2 {}

public class C
{
	static int M ()
	{
		return default (I3).GetP ();
	}
}

$ javac test.java

$ mcs test.cs
test.cs(9,24): warning CS1720: Expression will always cause a `System.NullReferenceException'
test.cs(9,37): error CS0121: The call is ambiguous between the following methods or properties: `I1.GetP()' and `I2.GetP()'
test.cs(1,27): (Location of the symbol related to previous error)
test.cs(2,27): (Location of the symbol related to previous error)
error CS5001: Program `test.exe' does not contain a static `Main' method suitable for an entry point
Compilation failed: 2 error(s), 1 warnings