Map deleted enum values to a sentinel value.

runtime/vm/symbols.h

 // 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.
 
 #ifndef RUNTIME_VM_SYMBOLS_H_
 #define RUNTIME_VM_SYMBOLS_H_
 
 #include "vm/growable_array.h"
 #include "vm/object.h"
 #include "vm/snapshot_ids.h"
@@ skipping 37 matching lines @@
   V(_AsyncStarStreamControllerConstructor, "_AsyncStarStreamController.")      \
   V(Controller, ":controller")                                                 \
   V(Stream, "stream")                                                          \
   V(isPaused, "isPaused")                                                      \
   V(AddError, "addError")                                                      \
   V(AddStream, "addStream")                                                    \
   V(Cancel, "cancel")                                                          \
   V(Close, "close")                                                            \
   V(Values, "values")                                                          \
   V(_EnumNames, "_enum_names")                                                 \
+  V(_DeletedEnumSentinel, "_deleted_enum_sentinel")                            \
+  V(_DeletedEnumPrefix, "Deleted enum value from ")                            \
   V(ExprTemp, ":expr_temp")                                                    \
   V(FinallyRetVal, ":finally_ret_val")                                         \
   V(AnonymousClosure, "<anonymous closure>")                                   \
   V(AnonymousSignature, "<anonymous signature>")                               \
   V(ImplicitClosure, "<implicit closure>")                                     \
   V(ClosureParameter, ":closure")                                              \
   V(TypeArgumentsParameter, ":type_arguments")                                 \
   V(FunctionInstantiatorVar, ":function_instantiator_var")                     \
   V(AssertionError, "_AssertionError")                                         \
   V(CastError, "_CastError")                                                   \
@@ skipping 597 matching lines @@
   friend class Serializer;
   friend class Deserializer;
   friend class ApiMessageReader;
 
   DISALLOW_COPY_AND_ASSIGN(Symbols);
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_SYMBOLS_H_