[INFO] cloning repository https://github.com/adrianbrink/rustlings
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/adrianbrink/rustlings" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fadrianbrink%2Frustlings", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fadrianbrink%2Frustlings'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0f7a4dbe9c6744b4f27a2960564cb8f67b4fda15
[INFO] testing adrianbrink/rustlings against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fadrianbrink%2Frustlings" "/workspace/builds/worker-18/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-18/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/adrianbrink/rustlings on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[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 /workspace/builds/worker-18/source/Cargo.toml
[INFO] crate git repo https://github.com/adrianbrink/rustlings already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b7285c7a8e4c96fb9a5e07a474d2a8b42f1e903885089588ef1c75e10fa1eab8
[INFO] running `Command { std: "docker" "start" "-a" "b7285c7a8e4c96fb9a5e07a474d2a8b42f1e903885089588ef1c75e10fa1eab8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b7285c7a8e4c96fb9a5e07a474d2a8b42f1e903885089588ef1c75e10fa1eab8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b7285c7a8e4c96fb9a5e07a474d2a8b42f1e903885089588ef1c75e10fa1eab8", kill_on_drop: false }`
[INFO] [stdout] b7285c7a8e4c96fb9a5e07a474d2a8b42f1e903885089588ef1c75e10fa1eab8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7027dffd9eed346705f77a244dd31b9d61e57e286a333aedcbd154294db03505
[INFO] running `Command { std: "docker" "start" "-a" "7027dffd9eed346705f77a244dd31b9d61e57e286a333aedcbd154294db03505", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling rustlings v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `is_even`
[INFO] [stdout]  --> src/tests.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn is_even(num: i32) -> bool {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `times_two`
[INFO] [stdout]  --> src/tests.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn times_two(num: i32) -> i32 {
[INFO] [stdout]   |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3m 04s
[INFO] running `Command { std: "docker" "inspect" "7027dffd9eed346705f77a244dd31b9d61e57e286a333aedcbd154294db03505", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7027dffd9eed346705f77a244dd31b9d61e57e286a333aedcbd154294db03505", kill_on_drop: false }`
[INFO] [stdout] 7027dffd9eed346705f77a244dd31b9d61e57e286a333aedcbd154294db03505
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 953d26c0c79052c291d6586636659c814abc3c88aa307d970e843fe168ba2ac2
[INFO] running `Command { std: "docker" "start" "-a" "953d26c0c79052c291d6586636659c814abc3c88aa307d970e843fe168ba2ac2", kill_on_drop: false }`
[INFO] [stdout] warning: function is never used: `is_even`
[INFO] [stdout]  --> src/tests.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn is_even(num: i32) -> bool {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling rustlings v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `times_two`
[INFO] [stdout]  --> src/tests.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn times_two(num: i32) -> i32 {
[INFO] [stdout]   |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.50s
[INFO] running `Command { std: "docker" "inspect" "953d26c0c79052c291d6586636659c814abc3c88aa307d970e843fe168ba2ac2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "953d26c0c79052c291d6586636659c814abc3c88aa307d970e843fe168ba2ac2", kill_on_drop: false }`
[INFO] [stdout] 953d26c0c79052c291d6586636659c814abc3c88aa307d970e843fe168ba2ac2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 380aa5d99680227d65825c682c7a494a3587221e8c5222dcde515a1c8ed25d2e
[INFO] running `Command { std: "docker" "start" "-a" "380aa5d99680227d65825c682c7a494a3587221e8c5222dcde515a1c8ed25d2e", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: function is never used: `is_even`
[INFO] [stderr]  --> src/tests.rs:1:4
[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:5:4
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn times_two(num: i32) -> i32 {
[INFO] [stderr]   |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `rustlings` (lib) generated 2 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.48s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/rustlings-66d106926b8e0786)
[INFO] [stdout] 
[INFO] [stdout] running 6 tests
[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_negative_numbers ... ok
[INFO] [stdout] test tests::tests::return_twice_of_positive_numbers ... ok
[INFO] [stdout] test tests::tests::you_can_assert ... ok
[INFO] [stdout] test tests::tests::you_can_assert_eq ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/rustlings-bb73096f13a2ef70)
[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; finished in 0.00s
[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; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "380aa5d99680227d65825c682c7a494a3587221e8c5222dcde515a1c8ed25d2e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "380aa5d99680227d65825c682c7a494a3587221e8c5222dcde515a1c8ed25d2e", kill_on_drop: false }`
[INFO] [stdout] 380aa5d99680227d65825c682c7a494a3587221e8c5222dcde515a1c8ed25d2e