anchor.diff:  class ConstantReferenceEmitter implements ConstantVisitor<jsAst.Expression> {
     final Compiler compiler;
     final Namer namer;
  -  bool inIsolateInitializationContext = false;
   
     ConstantReferenceEmitter(this.compiler, this.namer);
   
     jsAst.Expression generate(Constant constant) {
  -    inIsolateInitializationContext = false;
       return _visit(constant);
     }
   
     jsAst.Expression generateInInitializationContext(Constant constant) {
  -    inIsolateInitializationContext = true;
       return _visit(constant);
     }
   
  
positive.code:   }
  
    String getJsConstructor(ClassElement element) {
      return namer.isolatePropertiesAccess(element);
    }
  
    jsAst.Expression visitMap(MapConstant constant) {
  
negative.code:   }
  
    jsAst.Expression visitFunction(FunctionConstant constant) {
      return new jsAst.VariableUse(namer.isolateAccess(constant.element));
    }
  
    jsAst.Expression visitNull(NullConstant constant) {
  