SyncListFloat compiler lockup in 2017.1

How to lock up the Unity compiler in one easy step. Create this script in a new project. You don't need to attach it to anything. This didn't lock up in 5.4 or 5.6. Any idea if there might be a way around this? We really want to derive our own custom net behavior from the base class, and have lots of uses for SyncLists.

Code (CSharp):

1.  
2. using UnityEngine.Networking;
3.  
4. public class MyScript : MyNetBehaviour
5. {
6.     // Uncomment this to lock up during compile.
7.     // Comment it out to compile without problems.
8.     // Doesn't make a difference if you declare it null here and instantiate in Start.
9.     SyncListFloat m_NetCableTensions = new SyncListFloat();
10.  
11.     void Start()
12.     {
13.     }
14.  
15.     void Update()
16.     {
17.     }
18. }
19.  
20. public class MyNetBehaviour : NetworkBehaviour
21. {
22. }
23.