anchor.diff:      var element = accessor;
       if (accessor is PropertyAccessorElement) element = accessor.variable;
   
  +    // If this is one of our compiler's temporary variables, return its JS form.
  +    if (element is TemporaryVariableElement) {
  +      return element.jsVariable;
  +    }
  +
       // Directly emit constants.
       if (element is VariableElement && element.isStatic && element.isConst) {
         var val = element.computeConstantValue() as DartObjectImpl;
  
positive.code: 
      if (element is ParameterElement) {
        return _emitParameter(element);
      }
  
      // If this is one of our compiler's temporary variables, return its JS form.
      if (element is TemporaryVariableElement) {
        return element.jsVariable;
      }
  
      return new JS.Identifier(name);
  
negative.code: 
      variable ??= new JS.TemporaryId(name);
  
      var idElement = new TemporaryVariableElement.forNode(id, variable)
        ..enclosingElement = _currentElement;
      id.staticElement = idElement;
      id.staticType = type;
      setIsDynamicInvoke(id, dynamicInvoke ?? type.isDynamic);
  