Add new bug and new error

svn path=/trunk/mcs/; revision=1646

mcs/errors/bug6.cs

@@ -0,0 +1,11 @@
+public class X {
+
+	public enum Blah { A }
+
+}
+
+public class Y : X {
+
+	Blah x;
+	
+}

mcs/errors/cs0017.cs

@@ -0,0 +1,9 @@
+// cs0017.cs: Program has more than one entry point
+// Line: 7
+class X {
+static void Main () {}
+}
+class Y {
+static void Main () {
+}
+}