[INFO] updating cached repository sozu-proxy/keepalive-bench
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/sozu-proxy/keepalive-bench
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/sozu-proxy/keepalive-bench" "work/ex/beta-1.37-6/sources/1.36.0/gh/sozu-proxy/keepalive-bench"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/sozu-proxy/keepalive-bench'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/sozu-proxy/keepalive-bench" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/sozu-proxy/keepalive-bench"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/sozu-proxy/keepalive-bench'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ae1d1e142865e4b4c83f4f9a1def2470ef81e518
[INFO] sha for GitHub repo sozu-proxy/keepalive-bench: ae1d1e142865e4b4c83f4f9a1def2470ef81e518
[INFO] validating manifest of sozu-proxy/keepalive-bench on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of sozu-proxy/keepalive-bench on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing sozu-proxy/keepalive-bench
[INFO] finished frobbing sozu-proxy/keepalive-bench
[INFO] frobbed toml for sozu-proxy/keepalive-bench written to work/ex/beta-1.37-6/sources/1.36.0/gh/sozu-proxy/keepalive-bench/Cargo.toml
[INFO] started frobbing sozu-proxy/keepalive-bench
[INFO] finished frobbing sozu-proxy/keepalive-bench
[INFO] frobbed toml for sozu-proxy/keepalive-bench written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/sozu-proxy/keepalive-bench/Cargo.toml
[INFO] crate sozu-proxy/keepalive-bench already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing sozu-proxy/keepalive-bench against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-5/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/sozu-proxy/keepalive-bench:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] d89d4d3b3a8b1b51b600ae6d7789ed7f2c57eee647edfa54d8bff709779abc3a
[INFO] running `"docker" "start" "-a" "d89d4d3b3a8b1b51b600ae6d7789ed7f2c57eee647edfa54d8bff709779abc3a"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] [stderr]    Compiling rand v0.3.17
[INFO] [stderr]    Compiling csv-core v0.1.3
[INFO] [stderr]    Compiling env_logger v0.4.3
[INFO] [stderr]    Compiling csv v1.0.0-beta.5
[INFO] [stderr]    Compiling pretty_env_logger v0.1.1
[INFO] [stderr]    Compiling tokio-proto v0.1.1
[INFO] [stderr]    Compiling hyper v0.11.6 (https://github.com/hyperium/hyper#d3b19112)
[INFO] [stderr]    Compiling proxy-benchmark v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(conservative_impl_trait)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `header`
[INFO] [stderr]   --> src/main.rs:20:33
[INFO] [stderr]    |
[INFO] [stderr] 20 | use hyper::{Client, Uri, Error, header};
[INFO] [stderr]    |                                 ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `proxy-benchmark`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "d89d4d3b3a8b1b51b600ae6d7789ed7f2c57eee647edfa54d8bff709779abc3a"`
[INFO] running `"docker" "rm" "-f" "d89d4d3b3a8b1b51b600ae6d7789ed7f2c57eee647edfa54d8bff709779abc3a"`
[INFO] [stdout] d89d4d3b3a8b1b51b600ae6d7789ed7f2c57eee647edfa54d8bff709779abc3a