Version 3.7.1

src/messages.js

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 65 matching lines @@
       (obj instanceof $URIError);
 }
 
 
 // When formatting internally created error messages, do not
 // invoke overwritten error toString methods but explicitly use
 // the error to string method. This is to avoid leaking error
 // objects between script tags in a browser setting.
 function ToStringCheckErrorObject(obj) {
   if (IsNativeErrorObject(obj)) {
-    return %_CallFunction(obj, errorToString);
+    return %_CallFunction(obj, ErrorToString);
   } else {
     return ToString(obj);
   }
 }
 
 
 function ToDetailString(obj) {
   if (obj != null && IS_OBJECT(obj) && obj.toString === ObjectToString) {
     var constructor = obj.constructor;
     if (typeof constructor == "function") {
@@ skipping 81 matching lines @@
       "reduce_no_initial",            ["Reduce of empty array with no initial value"],
       "getter_must_be_callable",      ["Getter must be a function: ", "%0"],
       "setter_must_be_callable",      ["Setter must be a function: ", "%0"],
       "value_and_accessor",           ["Invalid property.  A property cannot both have accessors and be writable or have a value, ", "%0"],
       "proto_object_or_null",         ["Object prototype may only be an Object or null"],
       "property_desc_object",         ["Property description must be an object: ", "%0"],
       "redefine_disallowed",          ["Cannot redefine property: ", "%0"],
       "define_disallowed",            ["Cannot define property:", "%0", ", object is not extensible."],
       "non_extensible_proto",         ["%0", " is not extensible"],
       "handler_non_object",           ["Proxy.", "%0", " called with non-object as handler"],
-      "trap_function_expected",       ["Proxy.", "%0", " called with non-function for ", "%1", " trap"],
+      "proto_non_object",             ["Proxy.", "%0", " called with non-object as prototype"],
+      "trap_function_expected",       ["Proxy.", "%0", " called with non-function for '", "%1", "' trap"],
       "handler_trap_missing",         ["Proxy handler ", "%0", " has no '", "%1", "' trap"],
       "handler_trap_must_be_callable", ["Proxy handler ", "%0", " has non-callable '", "%1", "' trap"],
-      "handler_returned_false",       ["Proxy handler ", "%0", " returned false for '", "%1", "' trap"],
-      "handler_returned_undefined",   ["Proxy handler ", "%0", " returned undefined for '", "%1", "' trap"],
-      "proxy_prop_not_configurable",  ["Trap ", "%1", " of proxy handler ", "%0", " returned non-configurable descriptor for property ", "%2"],
-      "proxy_non_object_prop_names",  ["Trap ", "%1", " returned non-object ", "%0"],
-      "proxy_repeated_prop_name",     ["Trap ", "%1", " returned repeated property name ", "%2"],
+      "handler_returned_false",       ["Proxy handler ", "%0", " returned false from '", "%1", "' trap"],
+      "handler_returned_undefined",   ["Proxy handler ", "%0", " returned undefined from '", "%1", "' trap"],
+      "proxy_prop_not_configurable",  ["Proxy handler ", "%0", " returned non-configurable descriptor for property '", "%2", "' from '", "%1", "' trap"],
+      "proxy_non_object_prop_names",  ["Trap '", "%1", "' returned non-object ", "%0"],
+      "proxy_repeated_prop_name",     ["Trap '", "%1", "' returned repeated property name '", "%2", "'"],
       "invalid_weakmap_key",          ["Invalid value used as weak map key"],
       // RangeError
       "invalid_array_length",         ["Invalid array length"],
       "stack_overflow",               ["Maximum call stack size exceeded"],
       // SyntaxError
       "unable_to_parse",              ["Parse error"],
       "invalid_regexp_flags",         ["Invalid flags supplied to RegExp constructor '", "%0", "'"],
       "invalid_regexp",               ["Invalid RegExp pattern /", "%0", "/"],
       "illegal_break",                ["Illegal break statement"],
       "illegal_continue",             ["Illegal continue statement"],
@@ skipping 27 matching lines @@
       "strict_reserved_word",         ["Use of future reserved word in strict mode"],
       "strict_delete",                ["Delete of an unqualified identifier in strict mode."],
       "strict_delete_property",       ["Cannot delete property '", "%0", "' of ", "%1"],
       "strict_const",                 ["Use of const in strict mode."],
       "strict_function",              ["In strict mode code, functions can only be declared at top level or immediately within another function." ],
       "strict_read_only_property",    ["Cannot assign to read only property '", "%0", "' of ", "%1"],
       "strict_cannot_assign",         ["Cannot assign to read only '", "%0", "' in strict mode"],
       "strict_poison_pill",           ["'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them"],
       "strict_caller",                ["Illegal access to a strict mode caller function."],
       "unprotected_let",              ["Illegal let declaration in unprotected statement context."],
+      "unprotected_const",            ["Illegal const declaration in unprotected statement context."],
       "cant_prevent_ext_external_array_elements", ["Cannot prevent extension of an object with external array elements"],
       "redef_external_array_element", ["Cannot redefine a property of an object with external array elements"],
     ];
     var messages = { __proto__ : null };
     var desc = new PropertyDescriptor();
     desc.setConfigurable(false);
     desc.setEnumerable(false);
     desc.setWritable(false);
     for (var i = 0; i < messagesDictionary.length; i += 2) {
       var key = messagesDictionary[i];
@@ skipping 866 matching lines @@
           %IgnoreAttributesAndSetProperty(this,
                                           'message',
                                           ToString(m),
                                           DONT_ENUM);
         }
         captureStackTrace(this, f);
       } else {
         return new f(m);
       }
     });
+    %SetNativeFlag(f);
   }
 
   DefineError(function Error() { });
   DefineError(function TypeError() { });
   DefineError(function RangeError() { });
   DefineError(function SyntaxError() { });
   DefineError(function ReferenceError() { });
   DefineError(function EvalError() { });
   DefineError(function URIError() { });
 }
 
 SetUpError();
 
 $Error.captureStackTrace = captureStackTrace;
 
 %SetProperty($Error.prototype, 'message', '', DONT_ENUM);
 
-// Global list of error objects visited during errorToString. This is
+// Global list of error objects visited during ErrorToString. This is
 // used to detect cycles in error toString formatting.
 const visited_errors = new InternalArray();
 const cyclic_error_marker = new $Object();
 
-function errorToStringDetectCycle(error) {
+function ErrorToStringDetectCycle(error) {
   if (!%PushIfAbsent(visited_errors, error)) throw cyclic_error_marker;
   try {
     var type = error.type;
+    var name = error.name
+    name = IS_UNDEFINED(name) ? "Error" : TO_STRING_INLINE(name);
+    var message = error.message;
     var hasMessage = %_CallFunction(error, "message", ObjectHasOwnProperty);
     if (type && !hasMessage) {
-      var formatted = FormatMessage(%NewMessageObject(type, error.arguments));
-      return error.name + ": " + formatted;
+      message = FormatMessage(%NewMessageObject(type, error.arguments));
     }
-    var message = hasMessage ? (": " + error.message) : "";
-    return error.name + message;
+    message = IS_UNDEFINED(message) ? "" : TO_STRING_INLINE(message);
+    if (name === "") return message;
+    if (message === "") return name;
+    return name + ": " + message;
   } finally {
     visited_errors.length = visited_errors.length - 1;
   }
 }
 
-function errorToString() {
+function ErrorToString() {
   if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
     throw MakeTypeError("called_on_null_or_undefined",
                         ["Error.prototype.toString"]);
   }
-  // This helper function is needed because access to properties on
-  // the builtins object do not work inside of a catch clause.
-  function isCyclicErrorMarker(o) { return o === cyclic_error_marker; }
 
   try {
-    return errorToStringDetectCycle(this);
+    return ErrorToStringDetectCycle(this);
   } catch(e) {
     // If this error message was encountered already return the empty
     // string for it instead of recursively formatting it.
-    if (isCyclicErrorMarker(e)) {
+    if (e === cyclic_error_marker) {
       return '';
     }
     throw e;
   }
 }
 
 
-InstallFunctions($Error.prototype, DONT_ENUM, ['toString', errorToString]);
+InstallFunctions($Error.prototype, DONT_ENUM, ['toString', ErrorToString]);
 
 // Boilerplate for exceptions for stack overflows. Used from
 // Isolate::StackOverflow().
 const kStackOverflowBoilerplate = MakeRangeError('stack_overflow', []);