[INFO] updating cached repository jhwagner/rust_by_example_solutions
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/jhwagner/rust_by_example_solutions
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/jhwagner/rust_by_example_solutions" "work/ex/beta-1.38-1/sources/1.37.0/gh/jhwagner/rust_by_example_solutions"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/jhwagner/rust_by_example_solutions'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/jhwagner/rust_by_example_solutions" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jhwagner/rust_by_example_solutions"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jhwagner/rust_by_example_solutions'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 0aa32a7b0d6eca03e6ce044479a9b11f80e49c0c
[INFO] sha for GitHub repo jhwagner/rust_by_example_solutions: 0aa32a7b0d6eca03e6ce044479a9b11f80e49c0c
[INFO] validating manifest of jhwagner/rust_by_example_solutions 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 jhwagner/rust_by_example_solutions 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 jhwagner/rust_by_example_solutions
[INFO] finished frobbing jhwagner/rust_by_example_solutions
[INFO] frobbed toml for jhwagner/rust_by_example_solutions written to work/ex/beta-1.38-1/sources/1.37.0/gh/jhwagner/rust_by_example_solutions/Cargo.toml
[INFO] started frobbing jhwagner/rust_by_example_solutions
[INFO] finished frobbing jhwagner/rust_by_example_solutions
[INFO] frobbed toml for jhwagner/rust_by_example_solutions written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jhwagner/rust_by_example_solutions/Cargo.toml
[INFO] crate jhwagner/rust_by_example_solutions 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 jhwagner/rust_by_example_solutions 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-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/jhwagner/rust_by_example_solutions:/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] 98c8a708e6f94c59e0774aefd64bacc2b62f553078ac8470218a22c44c116e0f
[INFO] running `"docker" "start" "-a" "98c8a708e6f94c59e0774aefd64bacc2b62f553078ac8470218a22c44c116e0f"`
[INFO] [stderr]    Compiling rust_by_example_solutions v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: struct is never constructed: `Structure`
[INFO] [stderr]   --> src/bin/1_2_0_formatted_print.rs:27:5
[INFO] [stderr]    |
[INFO] [stderr] 27 |     struct Structure(i32);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.79s
[INFO] running `"docker" "inspect" "98c8a708e6f94c59e0774aefd64bacc2b62f553078ac8470218a22c44c116e0f"`
[INFO] running `"docker" "rm" "-f" "98c8a708e6f94c59e0774aefd64bacc2b62f553078ac8470218a22c44c116e0f"`
[INFO] [stdout] 98c8a708e6f94c59e0774aefd64bacc2b62f553078ac8470218a22c44c116e0f
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/jhwagner/rust_by_example_solutions:/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] 6dba03f7863b8e5bb2fc72f5045076779073e3e5cecde363bca547f9f0210beb
[INFO] running `"docker" "start" "-a" "6dba03f7863b8e5bb2fc72f5045076779073e3e5cecde363bca547f9f0210beb"`
[INFO] [stderr]    Compiling rust_by_example_solutions v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.46s
[INFO] running `"docker" "inspect" "6dba03f7863b8e5bb2fc72f5045076779073e3e5cecde363bca547f9f0210beb"`
[INFO] running `"docker" "rm" "-f" "6dba03f7863b8e5bb2fc72f5045076779073e3e5cecde363bca547f9f0210beb"`
[INFO] [stdout] 6dba03f7863b8e5bb2fc72f5045076779073e3e5cecde363bca547f9f0210beb
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/jhwagner/rust_by_example_solutions:/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] 9b86121a53553eb03978f994d7ce5b69b9759ecac1a7fb117b68a1020e29c725
[INFO] running `"docker" "start" "-a" "9b86121a53553eb03978f994d7ce5b69b9759ecac1a7fb117b68a1020e29c725"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/1_0_0_hello_world-df5b526fd7383f2b
[INFO] [stderr]      Running /opt/crater/target/debug/deps/1_2_0_formatted_print-cccb40d15111664b
[INFO] [stderr]      Running /opt/crater/target/debug/deps/1_2_2_display-82cd12d2dfb0eacb
[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] [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] [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] [stderr]      Running /opt/crater/target/debug/deps/1_2_3_formatting-3635c6387d8d3d58
[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] [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] [stderr]      Running /opt/crater/target/debug/deps/2_2_0_tuples-49a4d95d38dc1a04
[INFO] running `"docker" "inspect" "9b86121a53553eb03978f994d7ce5b69b9759ecac1a7fb117b68a1020e29c725"`
[INFO] running `"docker" "rm" "-f" "9b86121a53553eb03978f994d7ce5b69b9759ecac1a7fb117b68a1020e29c725"`
[INFO] [stdout] 9b86121a53553eb03978f994d7ce5b69b9759ecac1a7fb117b68a1020e29c725