Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/errors/cs0121-3.cs

@@ -0,0 +1,23 @@
+// CS0121: The call is ambiguous between the following methods or properties: `A.operator +(A, B)' and `B.operator +(A, B)'
+// Line: 21
+
+class A
+{
+	public static A operator + (A a, B b)
+	{
+		return null;
+	}
+}
+
+class B
+{
+	public static A operator + (A a, B b)
+	{
+		return null;
+	}
+
+	static void Main ()
+	{
+		object o = new A () + new B ();
+	}
+}