[INFO] updating cached repository bgammill/hello_rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/bgammill/hello_rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/bgammill/hello_rust" "work/ex/beta-1.38-1/sources/1.37.0/gh/bgammill/hello_rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/bgammill/hello_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/bgammill/hello_rust" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/bgammill/hello_rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/bgammill/hello_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] cdb9cc660b920725281324abce3aa60359439918
[INFO] sha for GitHub repo bgammill/hello_rust: cdb9cc660b920725281324abce3aa60359439918
[INFO] validating manifest of bgammill/hello_rust 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 bgammill/hello_rust 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 bgammill/hello_rust
[INFO] finished frobbing bgammill/hello_rust
[INFO] frobbed toml for bgammill/hello_rust written to work/ex/beta-1.38-1/sources/1.37.0/gh/bgammill/hello_rust/Cargo.toml
[INFO] started frobbing bgammill/hello_rust
[INFO] finished frobbing bgammill/hello_rust
[INFO] frobbed toml for bgammill/hello_rust written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/bgammill/hello_rust/Cargo.toml
[INFO] crate bgammill/hello_rust 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] testing bgammill/hello_rust 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-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/bgammill/hello_rust:/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] b8e4b65f74b3ac0b8a6f9a4c7d7f3f48bf010a50c637b2edafd4ad33b7a4747b
[INFO] running `"docker" "start" "-a" "b8e4b65f74b3ac0b8a6f9a4c7d7f3f48bf010a50c637b2edafd4ad33b7a4747b"`
[INFO] [stderr]    Compiling hello_rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> src/main.rs:12:9
[INFO] [stderr]    |
[INFO] [stderr] 12 |     for x in 0..request.number_of_times {
[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 0.68s
[INFO] running `"docker" "inspect" "b8e4b65f74b3ac0b8a6f9a4c7d7f3f48bf010a50c637b2edafd4ad33b7a4747b"`
[INFO] running `"docker" "rm" "-f" "b8e4b65f74b3ac0b8a6f9a4c7d7f3f48bf010a50c637b2edafd4ad33b7a4747b"`
[INFO] [stdout] b8e4b65f74b3ac0b8a6f9a4c7d7f3f48bf010a50c637b2edafd4ad33b7a4747b
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/bgammill/hello_rust:/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] 772d9751d1523607e82a7052e7d28acb4d5293959d0b43beb7070d56eb3ffd5f
[INFO] running `"docker" "start" "-a" "772d9751d1523607e82a7052e7d28acb4d5293959d0b43beb7070d56eb3ffd5f"`
[INFO] [stderr]    Compiling hello_rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> src/main.rs:12:9
[INFO] [stderr]    |
[INFO] [stderr] 12 |     for x in 0..request.number_of_times {
[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 0.94s
[INFO] running `"docker" "inspect" "772d9751d1523607e82a7052e7d28acb4d5293959d0b43beb7070d56eb3ffd5f"`
[INFO] running `"docker" "rm" "-f" "772d9751d1523607e82a7052e7d28acb4d5293959d0b43beb7070d56eb3ffd5f"`
[INFO] [stdout] 772d9751d1523607e82a7052e7d28acb4d5293959d0b43beb7070d56eb3ffd5f
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/bgammill/hello_rust:/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] 496b375b811965f27d308423e7e324172afc17dfbf839193d646836a30753e2b
[INFO] running `"docker" "start" "-a" "496b375b811965f27d308423e7e324172afc17dfbf839193d646836a30753e2b"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/hello_rust-f0d5ea87e085493f
[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" "496b375b811965f27d308423e7e324172afc17dfbf839193d646836a30753e2b"`
[INFO] running `"docker" "rm" "-f" "496b375b811965f27d308423e7e324172afc17dfbf839193d646836a30753e2b"`
[INFO] [stdout] 496b375b811965f27d308423e7e324172afc17dfbf839193d646836a30753e2b