Toward a green tools/build.py -cprecompiler -rdart_precompiled:

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 10344 matching lines @@
 
 
 bool LibraryPrefix::LoadLibrary() const {
   // Non-deferred prefixes are loaded.
   ASSERT(is_deferred_load() || is_loaded());
   if (is_loaded()) {
     return true;  // Load request has already completed.
   }
   ASSERT(is_deferred_load());
   ASSERT(num_imports() == 1);
+  if (Dart::IsRunningPrecompiledCode()) {

[Florian Schneider, 2016/03/01 22:53:44]

Should this be just 

#if defined(DART_PRECOMPILED_RUNTIME)

?

[rmacnak, 2016/03/01 23:03:29]

Issue #25894

+    // The library list was tree-shaken away.
+    this->set_is_loaded();
+    return true;
+  }
   // This is a prefix for a deferred library. If the library is not loaded
   // yet and isn't being loaded, call the library tag handler to schedule
   // loading. Once all outstanding load requests have completed, the embedder
   // will call the core library to:
   // - invalidate dependent code of this prefix;
   // - mark this prefixes as loaded;
   // - complete the future associated with this prefix.
   const Library& deferred_lib = Library::Handle(GetLibrary(0));
   if (deferred_lib.Loaded()) {
     this->set_is_loaded();
@@ skipping 11284 matching lines @@
   return UserTag::null();
 }
 
 
 const char* UserTag::ToCString() const {
   const String& tag_label = String::Handle(label());
   return tag_label.ToCString();
 }
 
 }  // namespace dart