Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/errors/cs0502.cs

@@ -0,0 +1,11 @@
+// CS0502: `Main.Test()' cannot be both abstract and sealed
+// Line: 10
+
+abstract class Base {
+    public abstract void Test ();
+}
+
+abstract class Main: Base
+{
+    public abstract sealed override void Test () {}
+}