Implement proper module linking.

src/messages.js

 // Copyright 2012 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 32 matching lines @@
   for (var i = 0; i < format.length; i++) {
     var str = format[i];
     if (str.length == 2 && %_StringCharCodeAt(str, 0) == 0x25) {
       // Two-char string starts with "%".
       var arg_num = (%_StringCharCodeAt(str, 1) - 0x30) >>> 0;
       if (arg_num < 4) {
         // str is one of %0, %1, %2 or %3.
         try {
           str = ToDetailString(args[arg_num]);
         } catch (e) {
-          str = "#<error>";
+          if (%IsJSModule(args[arg_num]))
+            str = "module";
+          else if (IS_SPEC_OBJECT(args[arg_num]))
+            str = "object";
+          else
+            str = "#<error>";
         }
       }
     }
     result += str;
   }
   return result;
 }
 
 
 // To check if something is a native error we need to check the
@@ skipping 180 matching lines @@
       "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"],
       "harmony_const_assign",         ["Assignment to constant variable."],
       "invalid_module_path",          ["Module does not export '", "%0", "', or export is not itself a module"],
       "module_type_error",            ["Module '", "%0", "' used improperly"],
+      "export_undefined",             ["Export '", "%0", "' is not defined in module"],

[Michael Starzinger, 2012/07/06 10:53:22]

Should we maybe name this "module_export_undefined"?

[rossberg, 2012/07/06 15:39:28]

Done.

     ];
     var messages = { __proto__ : null };
     for (var i = 0; i < messagesDictionary.length; i += 2) {
       var key = messagesDictionary[i];
       var format = messagesDictionary[i + 1];
 
       for (var j = 0; j < format.length; j++) {
         %IgnoreAttributesAndSetProperty(format, %_NumberToString(j), format[j],
                                         DONT_DELETE | READ_ONLY | DONT_ENUM);
       }
@@ skipping 989 matching lines @@
     throw e;
   }
 }
 
 
 InstallFunctions($Error.prototype, DONT_ENUM, ['toString', ErrorToString]);
 
 // Boilerplate for exceptions for stack overflows. Used from
 // Isolate::StackOverflow().
 var kStackOverflowBoilerplate = MakeRangeError('stack_overflow', []);