Add an imported into list for libraries so that it is possible to lookup

vm/class_finalizer.cc

 // Copyright (c) 2011, 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 75 matching lines @@
     if (FLAG_verify_implements) {
       for (intptr_t i = 0; i < class_array.Length(); i++) {
         cls ^= class_array.At(i);
         if (!cls.is_interface()) {
           VerifyClassImplements(cls);
         }
       }
     }
     // Clear pending classes array.
     object_store->set_pending_classes(Array::Handle(Array::Empty()));
+
+    // Check to ensure there are no duplicate definitions in the library
+    // hierarchy.
+    const String& str = String::Handle(Library::CheckForDuplicateDefinition());
+    if (!str.IsNull()) {
+      ReportError("Duplicate definition : %s\n", str.ToCString());
+    }
   } else {
     retval = false;
   }
   isolate->set_long_jump_base(base);
   return retval;
 }
 
 
 #if defined (DEBUG)
 // Adds all interfaces of cls into 'collected'. Duplicate entries may occur.
@@ skipping 879 matching lines @@
   ASSERT(msg_buffer != NULL);
   va_list args;
   va_start(args, format);
   OS::VSNPrint(msg_buffer, kBufferLength, format, args);
   va_end(args);
   isolate->long_jump_base()->Jump(1, msg_buffer);
   UNREACHABLE();
 }
 
 }  // namespace dart