Precompilation:

runtime/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/cpu.h"
@@ skipping 3322 matching lines @@
 
 
 TokenPosition Class::ComputeEndTokenPos() const {
   // Return the begin token for synthetic classes.
   if (is_synthesized_class() || IsMixinApplication() || IsTopLevel()) {
     return token_pos();
   }
   const Script& scr = Script::Handle(script());
   ASSERT(!scr.IsNull());
   const TokenStream& tkns = TokenStream::Handle(scr.tokens());
+  if (tkns.IsNull()) {
+    ASSERT(Dart::IsRunningPrecompiledCode());
+    return TokenPosition::kNoSource;
+  }
   TokenStream::Iterator tkit(tkns,
                              token_pos(),
                              TokenStream::Iterator::kNoNewlines);
   intptr_t level = 0;
   while (tkit.CurrentTokenKind() != Token::kEOS) {
     if (tkit.CurrentTokenKind() == Token::kLBRACE) {
       level++;
     } else if (tkit.CurrentTokenKind() == Token::kRBRACE) {
       if (--level == 0) {
         return tkit.CurrentPosition();
@@ skipping 18425 matching lines @@
   return UserTag::null();
 }
 
 
 const char* UserTag::ToCString() const {
   const String& tag_label = String::Handle(label());
   return tag_label.ToCString();
 }
 
 }  // namespace dart