Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/errors/cs0019-63.cs

@@ -0,0 +1,15 @@
+// CS0019: Operator `==' cannot be applied to operands of type `U' and `null'
+// Line: 13
+
+abstract class A<T>
+{
+	public abstract bool Foo<U> (U arg) where U : T;
+}
+
+class B : A<byte>
+{
+	public override bool Foo<U> (U arg)
+	{
+		return arg == null;
+	}
+}