Seen twice now with the failure message:

A WebException with status ReceiveFailure was thrown.

Logs:

• https://ci.appveyor.com/project/rust-lang/rust/build/1.0.1552/job/4xk7i4iwxanot5ot
• https://ci.appveyor.com/project/rust-lang/rust/build/1.0.1525/job/ps7k6254mi5f8v33
• https://ci.appveyor.com/project/rust-lang/rust/build/1.0.1649/job/0vj4vqd2u2xtk5ny

I'll probably email them about retries and such come next week, wanted to start collecting logs in the meantime.