[INFO] updating cached repository https://github.com/adrianbrink/rustlings
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 0f7a4dbe9c6744b4f27a2960564cb8f67b4fda15
[INFO] testing adrianbrink/rustlings against beta-2019-09-28 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fadrianbrink%2Frustlings" "work/builds/worker-4/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/adrianbrink/rustlings on toolchain beta-2019-09-28
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/adrianbrink/rustlings
[INFO] finished tweaking git repo https://github.com/adrianbrink/rustlings
[INFO] tweaked toml for git repo https://github.com/adrianbrink/rustlings written to work/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/adrianbrink/rustlings already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "build" "--frozen"`
[INFO] [stdout] c6549205eda54e6fe403f91f8973aa5e6b3e16407246b31e5429829daf40ee6c
[INFO] running `"docker" "start" "-a" "c6549205eda54e6fe403f91f8973aa5e6b3e16407246b31e5429829daf40ee6c"`
[INFO] [stderr]    Compiling rustlings v0.1.0 (/opt/rustwide/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 0.85s
[INFO] running `"docker" "inspect" "c6549205eda54e6fe403f91f8973aa5e6b3e16407246b31e5429829daf40ee6c"`
[INFO] running `"docker" "rm" "-f" "c6549205eda54e6fe403f91f8973aa5e6b3e16407246b31e5429829daf40ee6c"`
[INFO] [stdout] c6549205eda54e6fe403f91f8973aa5e6b3e16407246b31e5429829daf40ee6c
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "test" "--frozen" "--no-run"`
[INFO] [stdout] b0f919792a156b5403e18157ab23070188d60674012799f2e76d20a4f5d18eef
[INFO] running `"docker" "start" "-a" "b0f919792a156b5403e18157ab23070188d60674012799f2e76d20a4f5d18eef"`
[INFO] [stderr]    Compiling rustlings v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.33s
[INFO] running `"docker" "inspect" "b0f919792a156b5403e18157ab23070188d60674012799f2e76d20a4f5d18eef"`
[INFO] running `"docker" "rm" "-f" "b0f919792a156b5403e18157ab23070188d60674012799f2e76d20a4f5d18eef"`
[INFO] [stdout] b0f919792a156b5403e18157ab23070188d60674012799f2e76d20a4f5d18eef
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "test" "--frozen"`
[INFO] [stdout] dc503d7e058727ae3b66eb52c3d8358a5c940e85a4ec4ee335e4cc60929e9c2a
[INFO] running `"docker" "start" "-a" "dc503d7e058727ae3b66eb52c3d8358a5c940e85a4ec4ee335e4cc60929e9c2a"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/rustlings-c7239c2e57a4d6ab
[INFO] [stdout] 
[INFO] [stdout] running 6 tests
[INFO] [stdout] test tests::tests::return_twice_of_negative_numbers ... ok
[INFO] [stdout] test tests::tests::you_can_assert_eq ... ok
[INFO] [stdout] test tests::tests::is_true_when_even ... ok
[INFO] [stdout] test tests::tests::is_true_when_uneven ... ok
[INFO] [stdout] test tests::tests::return_twice_of_positive_numbers ... ok
[INFO] [stdout] test tests::tests::you_can_assert ... 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/rustwide/target/debug/deps/rustlings-5abb14b74a78e790
[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" "dc503d7e058727ae3b66eb52c3d8358a5c940e85a4ec4ee335e4cc60929e9c2a"`
[INFO] running `"docker" "rm" "-f" "dc503d7e058727ae3b66eb52c3d8358a5c940e85a4ec4ee335e4cc60929e9c2a"`
[INFO] [stdout] dc503d7e058727ae3b66eb52c3d8358a5c940e85a4ec4ee335e4cc60929e9c2a