A problem with downcasts (Did not occur until unity5)

After upgrading a project, I got one warning that I can not seem to fix.

At this line:

Code (JavaScript):

1. for(var bits : MeshRenderer in mrenders)
2.         bits.enabled = false;

Here's where the variable "mrenders" is established (a few lines before the code above):

Code (JavaScript):

1. var mrenders = gameObject.GetComponentsInChildren(MeshRenderer);

Was something in the API changed that could cause this, or did I just not notice this warning before?
I kind of get what a downcast is, I just don't how to fix it in this instance.

 

Thanks!