Use evaluate:source as the uri of eval scripts instead of the empty string, so e.g., package:stack…

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 2799 matching lines @@
 }
 
 
 static RawFunction* EvaluateHelper(const Class& cls,
                                    const String& expr,
                                    const Array& param_names,
                                    bool is_static) {
   const String& func_src =
       String::Handle(BuildClosureSource(param_names, expr));
   Script& script = Script::Handle();
-  script = Script::New(Symbols::Empty(), func_src, RawScript::kSourceTag);
+  script = Script::New(Symbols::EvalSourceUri(),
+                       func_src,
+                       RawScript::kSourceTag);
   // In order to tokenize the source, we need to get the key to mangle
   // private names from the library from which the class originates.
   const Library& lib = Library::Handle(cls.library());
   ASSERT(!lib.IsNull());
   const String& lib_key = String::Handle(lib.private_key());
   script.Tokenize(lib_key);
 
   const Function& func = Function::Handle(
        Function::NewEvalFunction(cls, script, is_static));
   func.set_result_type(Type::Handle(Type::DynamicType()));
@@ skipping 17884 matching lines @@
   return tag_label.ToCString();
 }
 
 
 void UserTag::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Instance::PrintJSONImpl(stream, ref);
 }
 
 
 }  // namespace dart