[INFO] updating cached repository adrianbrink/rustlings
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/adrianbrink/rustlings
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/adrianbrink/rustlings" "work/ex/beta-1.37-6/sources/1.36.0/gh/adrianbrink/rustlings"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/adrianbrink/rustlings'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/adrianbrink/rustlings" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/adrianbrink/rustlings"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/adrianbrink/rustlings'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 0f7a4dbe9c6744b4f27a2960564cb8f67b4fda15
[INFO] sha for GitHub repo adrianbrink/rustlings: 0f7a4dbe9c6744b4f27a2960564cb8f67b4fda15
[INFO] validating manifest of adrianbrink/rustlings 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 adrianbrink/rustlings 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 adrianbrink/rustlings
[INFO] finished frobbing adrianbrink/rustlings
[INFO] frobbed toml for adrianbrink/rustlings written to work/ex/beta-1.37-6/sources/1.36.0/gh/adrianbrink/rustlings/Cargo.toml
[INFO] started frobbing adrianbrink/rustlings
[INFO] finished frobbing adrianbrink/rustlings
[INFO] frobbed toml for adrianbrink/rustlings written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/adrianbrink/rustlings/Cargo.toml
[INFO] crate adrianbrink/rustlings 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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing adrianbrink/rustlings 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-0/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/adrianbrink/rustlings:/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] 218a4ac0a6bfd040289c3d7a7d77501da93957a22446cca1472d5205bcbbe82b
[INFO] running `"docker" "start" "-a" "218a4ac0a6bfd040289c3d7a7d77501da93957a22446cca1472d5205bcbbe82b"`
[INFO] [stderr]    Compiling rustlings v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: function is never used: `is_even`
[INFO] [stderr]  --> src/tests.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn is_even(num: i32) -> bool {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `times_two`
[INFO] [stderr]  --> src/tests.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn times_two(num: i32) -> i32 {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.36s
[INFO] running `"docker" "inspect" "218a4ac0a6bfd040289c3d7a7d77501da93957a22446cca1472d5205bcbbe82b"`
[INFO] running `"docker" "rm" "-f" "218a4ac0a6bfd040289c3d7a7d77501da93957a22446cca1472d5205bcbbe82b"`
[INFO] [stdout] 218a4ac0a6bfd040289c3d7a7d77501da93957a22446cca1472d5205bcbbe82b
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-0/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/adrianbrink/rustlings:/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] 729ce8e603bf259c71ff26eb5d1ed4afaaff6e459f0f9471f9214fb416047e8c
[INFO] running `"docker" "start" "-a" "729ce8e603bf259c71ff26eb5d1ed4afaaff6e459f0f9471f9214fb416047e8c"`
[INFO] [stderr]    Compiling rustlings v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.52s
[INFO] running `"docker" "inspect" "729ce8e603bf259c71ff26eb5d1ed4afaaff6e459f0f9471f9214fb416047e8c"`
[INFO] running `"docker" "rm" "-f" "729ce8e603bf259c71ff26eb5d1ed4afaaff6e459f0f9471f9214fb416047e8c"`
[INFO] [stdout] 729ce8e603bf259c71ff26eb5d1ed4afaaff6e459f0f9471f9214fb416047e8c
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-0/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/adrianbrink/rustlings:/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] 707cf96d4a81522469aa1d230d43eadf20625bff5849115281f0e30bc48d96b7
[INFO] running `"docker" "start" "-a" "707cf96d4a81522469aa1d230d43eadf20625bff5849115281f0e30bc48d96b7"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rustlings-45c0f14c7ef7e509
[INFO] [stdout] 
[INFO] [stdout] running 6 tests
[INFO] [stdout] test tests::tests::you_can_assert_eq ... ok
[INFO] [stdout] test tests::tests::you_can_assert ... ok
[INFO] [stdout] test tests::tests::return_twice_of_positive_numbers ... ok
[INFO] [stdout] test tests::tests::return_twice_of_negative_numbers ... ok
[INFO] [stdout] test tests::tests::is_true_when_even ... ok
[INFO] [stdout] test tests::tests::is_true_when_uneven ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rustlings-bf408b9fa04cceeb
[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]    Doc-tests rustlings
[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" "707cf96d4a81522469aa1d230d43eadf20625bff5849115281f0e30bc48d96b7"`
[INFO] running `"docker" "rm" "-f" "707cf96d4a81522469aa1d230d43eadf20625bff5849115281f0e30bc48d96b7"`
[INFO] [stdout] 707cf96d4a81522469aa1d230d43eadf20625bff5849115281f0e30bc48d96b7