Strict mode object literal validation

src/messages.js

Index: src/messages.js
diff --git a/src/messages.js b/src/messages.js
index e62f06fcf884857e18fca7c768833bf3ad82269e..6247875e9c2867c52a8c707180cca2e31c421275 100644
--- a/src/messages.js
+++ b/src/messages.js
@@ -209,6 +209,9 @@ function FormatMessage(message) {
       strict_param_dupe:            "Strict mode function may not have duplicate parameter names",
       strict_var_name:              "Variable name may not be eval or arguments in strict mode",
       strict_function_name:         "Function name may not be eval or arguments in strict mode",
+      strict_duplicate_property:    "Duplicate data property in object literal not allowed in strict mode",
+      accessor_data_property:       "Object literal may not have data and accessor property with the same name",
+      accessor_get_set:             "Object literal may not have multiple get/set accessors with the same name",
     };
   }
   var format = kMessages[message.type];