Don't call IdentifierPrettyName with signature classes.

vm/object.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/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/bigint_operations.h"
@@ skipping 1197 matching lines @@
     case kUint64Array:
     case kExternalUint64Array:
       return Symbols::New("Uint64List");
     case kFloat32Array:
     case kExternalFloat32Array:
       return Symbols::New("Float32List");
     case kFloat64Array:
     case kExternalFloat64Array:
       return Symbols::New("Float64List");
     default:
-      const String& name = String::Handle(Name());
-      return IdentifierPrettyName(name);
+      if (!IsSignatureClass()) {
+        const String& name = String::Handle(Name());
+        return IdentifierPrettyName(name);
+      } else {
+        return Name();
+      }
   }
   UNREACHABLE();
 }
 
 
 RawType* Class::SignatureType() const {
   ASSERT(IsSignatureClass());
   const Function& function = Function::Handle(signature_function());
   ASSERT(!function.IsNull());
   if (function.signature_class() != raw()) {
@@ skipping 9957 matching lines @@
 const char* JSRegExp::ToCString() const {
   const String& str = String::Handle(pattern());
   const char* format = "JSRegExp: pattern=%s flags=%s";
   intptr_t len = OS::SNPrint(NULL, 0, format, str.ToCString(), Flags());
   char* chars = Isolate::Current()->current_zone()->Alloc<char>(len + 1);
   OS::SNPrint(chars, (len + 1), format, str.ToCString(), Flags());
   return chars;
 }
 
 }  // namespace dart