[INFO] updating cached repository vasily-kirichenko/failure_perf_issue
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/vasily-kirichenko/failure_perf_issue
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/vasily-kirichenko/failure_perf_issue" "work/ex/beta-1.38-1/sources/1.37.0/gh/vasily-kirichenko/failure_perf_issue"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/vasily-kirichenko/failure_perf_issue'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/vasily-kirichenko/failure_perf_issue" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/vasily-kirichenko/failure_perf_issue"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/vasily-kirichenko/failure_perf_issue'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] cd2d108809f03ee3a02636d8c184f5f731abe8c4
[INFO] sha for GitHub repo vasily-kirichenko/failure_perf_issue: cd2d108809f03ee3a02636d8c184f5f731abe8c4
[INFO] validating manifest of vasily-kirichenko/failure_perf_issue on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of vasily-kirichenko/failure_perf_issue on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing vasily-kirichenko/failure_perf_issue
[INFO] finished frobbing vasily-kirichenko/failure_perf_issue
[INFO] frobbed toml for vasily-kirichenko/failure_perf_issue written to work/ex/beta-1.38-1/sources/1.37.0/gh/vasily-kirichenko/failure_perf_issue/Cargo.toml
[INFO] started frobbing vasily-kirichenko/failure_perf_issue
[INFO] finished frobbing vasily-kirichenko/failure_perf_issue
[INFO] frobbed toml for vasily-kirichenko/failure_perf_issue written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/vasily-kirichenko/failure_perf_issue/Cargo.toml
[INFO] crate vasily-kirichenko/failure_perf_issue already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing vasily-kirichenko/failure_perf_issue against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/vasily-kirichenko/failure_perf_issue:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 3b439286ff4dbc6b2320e3502fc7b1ee23f4e6696028132e879a7e8a08413bb1
[INFO] running `"docker" "start" "-a" "3b439286ff4dbc6b2320e3502fc7b1ee23f4e6696028132e879a7e8a08413bb1"`
[INFO] [stderr]    Compiling cc v1.0.12
[INFO] [stderr]    Compiling net2 v0.2.32
[INFO] [stderr]    Compiling relay v0.1.1
[INFO] [stderr]    Compiling tokio-timer v0.2.1
[INFO] [stderr]    Compiling tokio-io v0.1.6
[INFO] [stderr]    Compiling tokio-threadpool v0.1.2
[INFO] [stderr]    Compiling mio v0.6.14
[INFO] [stderr]    Compiling backtrace-sys v0.1.16
[INFO] [stderr]    Compiling tokio-reactor v0.1.1
[INFO] [stderr]    Compiling tokio-udp v0.1.0
[INFO] [stderr]    Compiling tokio-tcp v0.1.0
[INFO] [stderr]    Compiling tokio v0.1.5
[INFO] [stderr]    Compiling tokio-core v0.1.17
[INFO] [stderr]    Compiling tokio-proto v0.1.1
[INFO] [stderr]    Compiling hyper v0.11.25
[INFO] [stderr]    Compiling backtrace v0.3.6
[INFO] [stderr]    Compiling failure v0.1.1
[INFO] [stderr]    Compiling failure_perf_issue 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(iterator_find_map)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[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 `failure_perf_issue`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "3b439286ff4dbc6b2320e3502fc7b1ee23f4e6696028132e879a7e8a08413bb1"`
[INFO] running `"docker" "rm" "-f" "3b439286ff4dbc6b2320e3502fc7b1ee23f4e6696028132e879a7e8a08413bb1"`
[INFO] [stdout] 3b439286ff4dbc6b2320e3502fc7b1ee23f4e6696028132e879a7e8a08413bb1