Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/errors/cs0315-3.cs

@@ -0,0 +1,21 @@
+// CS0315: The type `int' cannot be used as type parameter `U' in the generic type or method `A<int?>.Test<U>()'. There is no boxing conversion from `int' to `int?'
+// Line: 19
+
+class A<T>
+{
+	public static void Test<U> () where U : T
+	{
+	}
+}
+
+class B : A<int?>
+{
+}
+
+class Program
+{
+	public static void Main ()
+	{
+		B.Test<int> ();
+	}
+}