[INFO] updating cached repository srazash/rust-learning
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/srazash/rust-learning
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/srazash/rust-learning" "work/ex/beta-1.38-1/sources/1.37.0/gh/srazash/rust-learning"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/srazash/rust-learning'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/srazash/rust-learning" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/srazash/rust-learning"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/srazash/rust-learning'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ef153437cddf9b63d53625aff9ba647ce2e4eb75
[INFO] sha for GitHub repo srazash/rust-learning: ef153437cddf9b63d53625aff9ba647ce2e4eb75
[INFO] validating manifest of srazash/rust-learning 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 srazash/rust-learning 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 srazash/rust-learning
[INFO] finished frobbing srazash/rust-learning
[INFO] frobbed toml for srazash/rust-learning written to work/ex/beta-1.38-1/sources/1.37.0/gh/srazash/rust-learning/Cargo.toml
[INFO] started frobbing srazash/rust-learning
[INFO] finished frobbing srazash/rust-learning
[INFO] frobbed toml for srazash/rust-learning written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/srazash/rust-learning/Cargo.toml
[INFO] crate srazash/rust-learning 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 srazash/rust-learning 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/srazash/rust-learning:/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] ecded638a9e1e049d3aaf7c1495759a36d366b504b66167f2d5e153edfa0e833
[INFO] running `"docker" "start" "-a" "ecded638a9e1e049d3aaf7c1495759a36d366b504b66167f2d5e153edfa0e833"`
[INFO] [stderr]    Compiling rust-learning v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]  --> src/main.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let s = "hello";
[INFO] [stderr]   |         ^ help: consider prefixing with an underscore: `_s`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.65s
[INFO] running `"docker" "inspect" "ecded638a9e1e049d3aaf7c1495759a36d366b504b66167f2d5e153edfa0e833"`
[INFO] running `"docker" "rm" "-f" "ecded638a9e1e049d3aaf7c1495759a36d366b504b66167f2d5e153edfa0e833"`
[INFO] [stdout] ecded638a9e1e049d3aaf7c1495759a36d366b504b66167f2d5e153edfa0e833
[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/srazash/rust-learning:/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] 2b27cb61f3550dacb4d2377d360e259d29141aefef956ed4285986ddc6c6b014
[INFO] running `"docker" "start" "-a" "2b27cb61f3550dacb4d2377d360e259d29141aefef956ed4285986ddc6c6b014"`
[INFO] [stderr]    Compiling rust-learning v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]  --> src/main.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let s = "hello";
[INFO] [stderr]   |         ^ help: consider prefixing with an underscore: `_s`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.70s
[INFO] running `"docker" "inspect" "2b27cb61f3550dacb4d2377d360e259d29141aefef956ed4285986ddc6c6b014"`
[INFO] running `"docker" "rm" "-f" "2b27cb61f3550dacb4d2377d360e259d29141aefef956ed4285986ddc6c6b014"`
[INFO] [stdout] 2b27cb61f3550dacb4d2377d360e259d29141aefef956ed4285986ddc6c6b014
[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/srazash/rust-learning:/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"`
[INFO] [stdout] 60d3124ac11906e6ca774c81314adcf30e28a7b8a9c6a8d6187d09cbdf9bcda6
[INFO] running `"docker" "start" "-a" "60d3124ac11906e6ca774c81314adcf30e28a7b8a9c6a8d6187d09cbdf9bcda6"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rust_learning-e421e4518c468cf0
[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" "60d3124ac11906e6ca774c81314adcf30e28a7b8a9c6a8d6187d09cbdf9bcda6"`
[INFO] running `"docker" "rm" "-f" "60d3124ac11906e6ca774c81314adcf30e28a7b8a9c6a8d6187d09cbdf9bcda6"`
[INFO] [stdout] 60d3124ac11906e6ca774c81314adcf30e28a7b8a9c6a8d6187d09cbdf9bcda6