[INFO] updating cached repository statianzo/imposters
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/statianzo/imposters
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/statianzo/imposters" "work/ex/beta-1.38-1/sources/1.37.0/gh/statianzo/imposters"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/statianzo/imposters'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/statianzo/imposters" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/statianzo/imposters"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/statianzo/imposters'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 344a5027ba57464a424c1906376445b6e208cb57
[INFO] sha for GitHub repo statianzo/imposters: 344a5027ba57464a424c1906376445b6e208cb57
[INFO] validating manifest of statianzo/imposters 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 statianzo/imposters 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 statianzo/imposters
[INFO] finished frobbing statianzo/imposters
[INFO] frobbed toml for statianzo/imposters written to work/ex/beta-1.38-1/sources/1.37.0/gh/statianzo/imposters/Cargo.toml
[INFO] started frobbing statianzo/imposters
[INFO] finished frobbing statianzo/imposters
[INFO] frobbed toml for statianzo/imposters written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/statianzo/imposters/Cargo.toml
[INFO] crate statianzo/imposters 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 statianzo/imposters against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/statianzo/imposters:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 70212eab37bb759c71982dac312819e852472236b01f673d2353b33557a718d2
[INFO] running `"docker" "start" "-a" "70212eab37bb759c71982dac312819e852472236b01f673d2353b33557a718d2"`
[INFO] [stderr]    Compiling imposters v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.77s
[INFO] running `"docker" "inspect" "70212eab37bb759c71982dac312819e852472236b01f673d2353b33557a718d2"`
[INFO] running `"docker" "rm" "-f" "70212eab37bb759c71982dac312819e852472236b01f673d2353b33557a718d2"`
[INFO] [stdout] 70212eab37bb759c71982dac312819e852472236b01f673d2353b33557a718d2
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/statianzo/imposters:/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" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] 0d966b80eada2dfb313333e76f5a2b017e7cdc1acea3f1aecfc7bff374fc7803
[INFO] running `"docker" "start" "-a" "0d966b80eada2dfb313333e76f5a2b017e7cdc1acea3f1aecfc7bff374fc7803"`
[INFO] [stderr]    Compiling rand v0.5.3
[INFO] [stderr]    Compiling env_logger v0.5.10
[INFO] [stderr]    Compiling quickcheck v0.6.2
[INFO] [stderr]    Compiling imposters v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta 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 `imposters`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "0d966b80eada2dfb313333e76f5a2b017e7cdc1acea3f1aecfc7bff374fc7803"`
[INFO] running `"docker" "rm" "-f" "0d966b80eada2dfb313333e76f5a2b017e7cdc1acea3f1aecfc7bff374fc7803"`
[INFO] [stdout] 0d966b80eada2dfb313333e76f5a2b017e7cdc1acea3f1aecfc7bff374fc7803