/testfor command no longer works

Confirmed.

This may have something to do with the Minecarts with Command Blocks, it makes sense for them to say that because they cannot be connected to a comparator.

I attached the screenshot from my report to keep them all in one place.

Mine has nothing to do with minecarts, it's specifically testing for any player within a three block radius of the command block and I get the same output error.
My command is a simple: testfor @p[r=3], the error I get is [timestamp] /testfor is only usable by commandblocks with analog output.
This same command was working fine in the previous snapshot.

This happened to me to! I was making custom mob drops for my system and I tried it and the same thing happened. This is a huge interference with my system. Plz fix it

@Ethan Brown, if you have access to the server you're using (and I'm assuming you do since you're using a snapshot), you can just revert to the previous snapshot (13w38c I believe), and your command blocks will work again, at least it did for me.

I'm sure they'll work out the error in the new snapshot in short order.

Sorry if I confused anyone, I mean it may have to do with the addition of minecarts with command blocks, I understand they were not involved directly. I mean from a coding perspective perhaps that was the problem.

Hopefully we will see 13w39b very soon to fix these issues