[INFO] updating cached repository Vurich/rustfest-perf-workshop
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Vurich/rustfest-perf-workshop
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Vurich/rustfest-perf-workshop" "work/ex/beta-1.38-1/sources/1.37.0/gh/Vurich/rustfest-perf-workshop"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Vurich/rustfest-perf-workshop'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Vurich/rustfest-perf-workshop" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Vurich/rustfest-perf-workshop"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Vurich/rustfest-perf-workshop'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2de13b519364acdc656177438f6b134f8f3a7817
[INFO] sha for GitHub repo Vurich/rustfest-perf-workshop: 2de13b519364acdc656177438f6b134f8f3a7817
[INFO] validating manifest of Vurich/rustfest-perf-workshop 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 Vurich/rustfest-perf-workshop 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 Vurich/rustfest-perf-workshop
[INFO] finished frobbing Vurich/rustfest-perf-workshop
[INFO] frobbed toml for Vurich/rustfest-perf-workshop written to work/ex/beta-1.38-1/sources/1.37.0/gh/Vurich/rustfest-perf-workshop/Cargo.toml
[INFO] started frobbing Vurich/rustfest-perf-workshop
[INFO] finished frobbing Vurich/rustfest-perf-workshop
[INFO] frobbed toml for Vurich/rustfest-perf-workshop written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Vurich/rustfest-perf-workshop/Cargo.toml
[INFO] crate Vurich/rustfest-perf-workshop 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing Vurich/rustfest-perf-workshop 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-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Vurich/rustfest-perf-workshop:/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] 35b1f2acfe6ed4de8b7323a05a9ec58de95efb4ff4b75c41920c6ddd96190b9e
[INFO] running `"docker" "start" "-a" "35b1f2acfe6ed4de8b7323a05a9ec58de95efb4ff4b75c41920c6ddd96190b9e"`
[INFO] [stderr]    Compiling either v1.5.0
[INFO] [stderr]    Compiling memchr v2.0.1
[INFO] [stderr]    Compiling combine v3.2.0
[INFO] [stderr]    Compiling rustfest v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 20.15s
[INFO] running `"docker" "inspect" "35b1f2acfe6ed4de8b7323a05a9ec58de95efb4ff4b75c41920c6ddd96190b9e"`
[INFO] running `"docker" "rm" "-f" "35b1f2acfe6ed4de8b7323a05a9ec58de95efb4ff4b75c41920c6ddd96190b9e"`
[INFO] [stdout] 35b1f2acfe6ed4de8b7323a05a9ec58de95efb4ff4b75c41920c6ddd96190b9e
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Vurich/rustfest-perf-workshop:/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" "test" "--frozen" "--no-run"`
[INFO] [stdout] 5033fc3f2e40680f140e033d574a1a77f8353fc9c54da153188e0b4593262105
[INFO] running `"docker" "start" "-a" "5033fc3f2e40680f140e033d574a1a77f8353fc9c54da153188e0b4593262105"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling rustfest v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:1:19
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![cfg_attr(test, feature(test))]
[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 `rustfest`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "5033fc3f2e40680f140e033d574a1a77f8353fc9c54da153188e0b4593262105"`
[INFO] running `"docker" "rm" "-f" "5033fc3f2e40680f140e033d574a1a77f8353fc9c54da153188e0b4593262105"`
[INFO] [stdout] 5033fc3f2e40680f140e033d574a1a77f8353fc9c54da153188e0b4593262105