Improve the stack trace output to be more readable.

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 VM_SYMBOLS_H_
 #define VM_SYMBOLS_H_
 
 #include "vm/object.h"
 
 namespace dart {
 
 // Forward declarations.
 class Isolate;
 class ObjectPointerVisitor;
 
 #define PREDEFINED_SYMBOLS_LIST(V)                                             \
   V(Dot, ".")                                                                  \
+  V(Equals, "=")                                                               \
   V(IndexToken, "[]")                                                          \
   V(AssignIndexToken, "[]=")                                                   \
   V(TopLevel, "::")                                                            \
   V(Empty, "")                                                                 \
   V(This, "this")                                                              \
   V(HasNext, "hasNext")                                                        \
   V(Next, "next")                                                              \
   V(Value, "value")                                                            \
   V(ExprTemp, ":expr_temp")                                                    \
-  V(Function, "function")                                                      \
+  V(AnonymousClosure, "<anonymous closure>")                                   \
   V(PhaseParameter, ":phase")                                                  \
   V(TypeArgumentsParameter, ":type_arguments")                                 \
   V(AssertionError, "AssertionError")                                          \
   V(TypeError, "TypeError")                                                    \
   V(FallThroughError, "FallThroughError")                                      \
   V(StaticResolutionException, "StaticResolutionException")                    \
   V(ThrowNew, "_throwNew")                                                     \
   V(ListLiteralFactoryClass, "_ListLiteralFactory")                            \
   V(ListLiteralFactory, "List.fromLiteral")                                    \
   V(MapLiteralFactoryClass, "_MapLiteralFactory")                              \
@@ skipping 98 matching lines @@
   friend class SnapshotReader;
   friend class SnapshotWriter;
   friend class ApiMessageReader;
 
   DISALLOW_COPY_AND_ASSIGN(Symbols);
 };
 
 }  // namespace dart
 
 #endif  // VM_SYMBOLS_H_