[INFO] updating cached repository qrdean/rust_hello
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/qrdean/rust_hello
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/qrdean/rust_hello" "work/ex/beta-1.38-1/sources/1.37.0/gh/qrdean/rust_hello"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/qrdean/rust_hello'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/qrdean/rust_hello" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/qrdean/rust_hello"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/qrdean/rust_hello'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 060caf4f553ad43cfca121a2ccd437a286c8fcdf
[INFO] sha for GitHub repo qrdean/rust_hello: 060caf4f553ad43cfca121a2ccd437a286c8fcdf
[INFO] validating manifest of qrdean/rust_hello 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 qrdean/rust_hello 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 qrdean/rust_hello
[INFO] finished frobbing qrdean/rust_hello
[INFO] frobbed toml for qrdean/rust_hello written to work/ex/beta-1.38-1/sources/1.37.0/gh/qrdean/rust_hello/Cargo.toml
[INFO] started frobbing qrdean/rust_hello
[INFO] finished frobbing qrdean/rust_hello
[INFO] frobbed toml for qrdean/rust_hello written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/qrdean/rust_hello/Cargo.toml
[INFO] crate qrdean/rust_hello 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 qrdean/rust_hello 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-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/qrdean/rust_hello:/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] 29fabac6c34fe56baa720dde53ca40d7726f047224c47c723828900ecbda024f
[INFO] running `"docker" "start" "-a" "29fabac6c34fe56baa720dde53ca40d7726f047224c47c723828900ecbda024f"`
[INFO] [stderr]    Compiling hello_world v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]  --> src/main.rs:2:6
[INFO] [stderr]   |
[INFO] [stderr] 2 |     let x: i32;
[INFO] [stderr]   |         ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.50s
[INFO] running `"docker" "inspect" "29fabac6c34fe56baa720dde53ca40d7726f047224c47c723828900ecbda024f"`
[INFO] running `"docker" "rm" "-f" "29fabac6c34fe56baa720dde53ca40d7726f047224c47c723828900ecbda024f"`
[INFO] [stdout] 29fabac6c34fe56baa720dde53ca40d7726f047224c47c723828900ecbda024f
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/qrdean/rust_hello:/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] 40a1b49ef387a96de44bf18a20338d6e1164857bf6b9d70efcd1b940d29df803
[INFO] running `"docker" "start" "-a" "40a1b49ef387a96de44bf18a20338d6e1164857bf6b9d70efcd1b940d29df803"`
[INFO] [stderr]    Compiling hello_world v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]  --> src/main.rs:2:6
[INFO] [stderr]   |
[INFO] [stderr] 2 |     let x: i32;
[INFO] [stderr]   |         ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.60s
[INFO] running `"docker" "inspect" "40a1b49ef387a96de44bf18a20338d6e1164857bf6b9d70efcd1b940d29df803"`
[INFO] running `"docker" "rm" "-f" "40a1b49ef387a96de44bf18a20338d6e1164857bf6b9d70efcd1b940d29df803"`
[INFO] [stdout] 40a1b49ef387a96de44bf18a20338d6e1164857bf6b9d70efcd1b940d29df803
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/qrdean/rust_hello:/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"`
[INFO] [stdout] d436ff09c6068dc74276b91d2059efd2ff388781db1bc2b744a17179ffebb71f
[INFO] running `"docker" "start" "-a" "d436ff09c6068dc74276b91d2059efd2ff388781db1bc2b744a17179ffebb71f"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/hello_world-f3fa3631b8c50bb1
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "d436ff09c6068dc74276b91d2059efd2ff388781db1bc2b744a17179ffebb71f"`
[INFO] running `"docker" "rm" "-f" "d436ff09c6068dc74276b91d2059efd2ff388781db1bc2b744a17179ffebb71f"`
[INFO] [stdout] d436ff09c6068dc74276b91d2059efd2ff388781db1bc2b744a17179ffebb71f