-e: Using a c# lambda that returns void will cause a project to be unable to be compiled for webGL

-repro:
--make new proj
--create c# script and add it to scene
---code:
using UnityEngine;
using System.Collections;
using System;

public class script : MonoBehaviour {

Func<string, Void> func;

void Start () {
func = (a) => {
Debug.Log(a + " asdf");
};
}

void Update () {
func ("test");
}
}

--start build for webgl
--NOTICE build fails with errors