Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/tests/gtest-variance-19.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+
+public class Test
+{
+	static void Bla<T, U> () where T : class, U
+	{
+		T[] ta = new T[0];
+		IEnumerable<T> ita = ta;
+		IEnumerable<U> itu = ita;
+	}
+
+	public static void Main ()
+	{
+		Bla<string, object> ();
+	}
+}