Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/tests/test-538.cs

@@ -0,0 +1,18 @@
+delegate IInterface testDelegate(concrete x);
+
+interface IInterface {
+}
+
+class concrete : IInterface {
+}
+
+class Program {
+   private concrete getConcrete(IInterface z) {
+      return new concrete();
+   }
+   
+   public static void Main(string[] args) {
+      Program p = new Program();
+      testDelegate x = new testDelegate(p.getConcrete);
+   }
+}