[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-1.37-6/sources/1.36.0/gh/srazash/rust-learning"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/srazash/rust-learning'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/srazash/rust-learning" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/srazash/rust-learning"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/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 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of srazash/rust-learning on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "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-1.37-6/sources/1.36.0/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-1.37-6/sources/beta-2019-07-23/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" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing srazash/rust-learning against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/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-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 63eec97366a58e77a40913172fa39d1e2ad44fd7d603e9a9fca5d627d6f1ae85
[INFO] running `"docker" "start" "-a" "63eec97366a58e77a40913172fa39d1e2ad44fd7d603e9a9fca5d627d6f1ae85"`
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]    Compiling rand v0.6.5
[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 4.76s
[INFO] running `"docker" "inspect" "63eec97366a58e77a40913172fa39d1e2ad44fd7d603e9a9fca5d627d6f1ae85"`
[INFO] running `"docker" "rm" "-f" "63eec97366a58e77a40913172fa39d1e2ad44fd7d603e9a9fca5d627d6f1ae85"`
[INFO] [stdout] 63eec97366a58e77a40913172fa39d1e2ad44fd7d603e9a9fca5d627d6f1ae85
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/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-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] b3beb8be3617573fff6112a3aa9ddc5b248ce40c8e6e3ce1af15b089da2adadc
[INFO] running `"docker" "start" "-a" "b3beb8be3617573fff6112a3aa9ddc5b248ce40c8e6e3ce1af15b089da2adadc"`
[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 0.68s
[INFO] running `"docker" "inspect" "b3beb8be3617573fff6112a3aa9ddc5b248ce40c8e6e3ce1af15b089da2adadc"`
[INFO] running `"docker" "rm" "-f" "b3beb8be3617573fff6112a3aa9ddc5b248ce40c8e6e3ce1af15b089da2adadc"`
[INFO] [stdout] b3beb8be3617573fff6112a3aa9ddc5b248ce40c8e6e3ce1af15b089da2adadc
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/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-2019-07-23" "test" "--frozen"`
[INFO] [stdout] 96bb37f9f8fd9854f813b3ae1c89230246f6eb095509acc89de9a6e93a8e661f
[INFO] running `"docker" "start" "-a" "96bb37f9f8fd9854f813b3ae1c89230246f6eb095509acc89de9a6e93a8e661f"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rust_learning-62cf88574495f0fa
[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" "96bb37f9f8fd9854f813b3ae1c89230246f6eb095509acc89de9a6e93a8e661f"`
[INFO] running `"docker" "rm" "-f" "96bb37f9f8fd9854f813b3ae1c89230246f6eb095509acc89de9a6e93a8e661f"`
[INFO] [stdout] 96bb37f9f8fd9854f813b3ae1c89230246f6eb095509acc89de9a6e93a8e661f