Distinguish between malformed and malbounded types more efficiently using the

runtime/vm/dart_api_impl.cc

 // Copyright (c) 2013, 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 "include/dart_api.h"
 #include "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 
 #include "platform/assert.h"
 #include "vm/bigint_operations.h"
@@ skipping 2856 matching lines @@
   Function& constructor = Function::Handle(isolate);
   constructor ^= result.raw();
 
   Instance& new_object = Instance::Handle(isolate);
   if (constructor.IsRedirectingFactory()) {
     ClassFinalizer::ResolveRedirectingFactory(cls, constructor);
     Type& redirect_type = Type::Handle(constructor.RedirectionType());
     constructor = constructor.RedirectionTarget();
     if (constructor.IsNull()) {
       ASSERT(redirect_type.IsMalformed());
-      return Api::NewHandle(isolate, redirect_type.malformed_error());
+      return Api::NewHandle(isolate, redirect_type.error());
     }
 
     if (!redirect_type.IsInstantiated()) {
       // The type arguments of the redirection type are instantiated from the
       // type arguments of the type argument.
       Error& bound_error = Error::Handle();
       redirect_type ^= redirect_type.InstantiateFrom(type_arguments,
                                                      &bound_error);
       if (!bound_error.IsNull()) {
         return Api::NewHandle(isolate, bound_error.raw());
@@ skipping 1555 matching lines @@
   }
   {
     NoGCScope no_gc;
     RawObject* raw_obj = obj.raw();
     isolate->heap()->SetPeer(raw_obj, peer);
   }
   return Api::Success();
 }
 
 }  // namespace dart