Improving error messages when adding properties to non JSObject receiver in

src/messages.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // The infrastructure used for (localized) message reporting in V8.
 //
 // Note: there's a big unresolved issue about ownership of the data
 // structures used by this framework.
 
 #ifndef V8_MESSAGES_H_
@@ skipping 195 matching lines @@
   T(ResolverNotAFunction, "Promise resolver % is not a function")              \
   T(RestrictedFunctionProperties,                                              \
     "'caller' and 'arguments' are restricted function properties and cannot "  \
     "be accessed in this context.")                                            \
   T(StaticPrototype, "Classes may not have static property named prototype")   \
   T(StrictCannotAssign, "Cannot assign to read only '% in strict mode")        \
   T(StrictDeleteProperty, "Cannot delete property '%' of %")                   \
   T(StrictPoisonPill,                                                          \
     "'caller', 'callee', and 'arguments' properties may not be accessed on "   \
     "strict mode functions or the arguments objects for calls to them")        \
-  T(StrictReadOnlyProperty, "Cannot assign to read only property '%' of %")    \
+  T(StrictReadOnlyProperty,                                                    \
+    "Cannot assign to read only property '%' of % '%'")                        \
+  T(StrictCannotCreateProperty, "Cannot create property '%' on % '%'")         \
   T(StrongArity,                                                               \
     "In strong mode, calling a function with too few arguments is deprecated") \
   T(StrongDeleteProperty,                                                      \
     "Deleting property '%' of strong object '%' is deprecated")                \
   T(StrongExtendNull, "In strong mode, classes extending null are deprecated") \
   T(StrongImplicitConversion,                                                  \
     "In strong mode, implicit conversions are deprecated")                     \
   T(StrongRedefineDisallowed,                                                  \
     "On strong object %, redefining writable, non-configurable property '%' "  \
     "to be non-writable is deprecated")                                        \
@@ skipping 260 matching lines @@
   static MUST_USE_RESULT MaybeHandle<String> GetStringifiedProperty(
       Isolate* isolate, LookupIterator* property_lookup,
       Handle<String> default_value);
 
   List<Handle<JSObject> > visited_;
 };
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_MESSAGES_H_