Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/errors/cs0660.cs

@@ -0,0 +1,21 @@
+// CS0660: `T' defines operator == or operator != but does not override Object.Equals(object o)
+// Line: 5
+// Compiler options: -warnaserror -warn:3
+
+class T
+{
+        public static bool operator == (object o, T t)
+        {
+            return false;
+        }
+
+        public static bool operator != (object o, T t)
+        {
+            return true;
+        }
+        
+        public override int GetHashCode ()
+        {
+            return base.GetHashCode ();
+        }
+}