Convert String to a class.

runtime/vm/class_finalizer.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/class_finalizer.h"
 
 #include "vm/flags.h"
 #include "vm/heap.h"
 #include "vm/isolate.h"
 #include "vm/longjump.h"
@@ skipping 277 matching lines @@
       case kUint64ArrayCid:
       case kExternalUint64ArrayCid:
       case kFloat32ArrayCid:
       case kExternalFloat32ArrayCid:
       case kFloat64ArrayCid:
       case kExternalFloat64ArrayCid:
       case kDartFunctionCid:
       case kWeakPropertyCid:
         is_error = true;
         break;
-      default:
+      default: {
         // Special case: classes for which we don't have a known class id.
         // TODO(regis): Why isn't comparing to kIntegerCid enough?
         if (Type::Handle(Type::Double()).type_class() == super_class.raw() ||
-            Type::Handle(Type::IntType()).type_class() == super_class.raw()) {
+            Type::Handle(Type::IntType()).type_class() == super_class.raw() ||
+            Type::Handle(
+                Type::StringType()).type_class() == super_class.raw()) {
           is_error = true;
         }
         break;
+      }
     }
     if (is_error) {
       const Script& script = Script::Handle(cls.script());
       ReportError(script, cls.token_pos(),
                   "'%s' is not allowed to extend '%s'",
                   String::Handle(cls.Name()).ToCString(),
                   String::Handle(super_class.Name()).ToCString());
     }
   }
   return;
@@ skipping 1069 matching lines @@
     }
     // Verify that unless cls belongs to core lib, it cannot extend or implement
     // any of bool, num, int, double, String, Function, dynamic.
     // The exception is signature classes, which are compiler generated and
     // represent a function type, therefore implementing the Function interface.
     if (!cls_belongs_to_core_lib) {
       if (interface.IsBoolType() ||
           interface.IsNumberType() ||
           interface.IsIntType() ||
           interface.IsDoubleType() ||
-          interface.IsStringInterface() ||
+          interface.IsStringType() ||
           (interface.IsFunctionType() && !cls.IsSignatureClass()) ||
           interface.IsDynamicType()) {
         const Script& script = Script::Handle(cls.script());
         ReportError(script, cls.token_pos(),
                     "'%s' is not allowed to extend or implement '%s'",
                     String::Handle(cls.Name()).ToCString(),
                     String::Handle(interface_class.Name()).ToCString());
       }
     }
     // Now resolve the super interfaces.
@@ skipping 182 matching lines @@
 void ClassFinalizer::ReportError(const char* format, ...) {
   va_list args;
   va_start(args, format);
   const Error& error = Error::Handle(
       Parser::FormatError(Script::Handle(), -1, "Error", format, args));
   va_end(args);
   ReportError(error);
 }
 
 }  // namespace dart