servo: Merge #11080 - Update Rust to 2016-05-07 (from servo:rustup); r=KiChjang

WOOOO RUST_NEW_ERROR_FORMAT Source-Repo: https://github.com/servo/servo Source-Revision: 06c2ab79e6002a41cae0555260bd3be0a7b54562
2016-05-08 03:57:09 -07:00 · 2016-05-08 03:57:09 -07:00 · 90376e75e6
--- a/servo/rust-nightly-date
+++ b/servo/rust-nightly-date
@ -1 +1 @@
-2016-04-29
+2016-05-07