[INFO] updating cached repository https://github.com/upenn-cis198-2018f/lecture7
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 80ae528176dbb3977613343c752420486c8dccd9
[INFO] testing upenn-cis198-2018f/lecture7 against master#a77da2d454e6caa227a85b16410b95f93495e7e0 for pr-91031
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fupenn-cis198-2018f%2Flecture7" "/workspace/builds/worker-22/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-22/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/upenn-cis198-2018f/lecture7 on toolchain a77da2d454e6caa227a85b16410b95f93495e7e0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/upenn-cis198-2018f/lecture7
[INFO] finished tweaking git repo https://github.com/upenn-cis198-2018f/lecture7
[INFO] tweaked toml for git repo https://github.com/upenn-cis198-2018f/lecture7 written to /workspace/builds/worker-22/source/Cargo.toml
[INFO] crate git repo https://github.com/upenn-cis198-2018f/lecture7 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "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-22/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 20b64ece627d113b4e481f420925f9cd5a15bb28c7ce6b8a7f6fb6dfef2619b3
[INFO] running `Command { std: "docker" "start" "-a" "20b64ece627d113b4e481f420925f9cd5a15bb28c7ce6b8a7f6fb6dfef2619b3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "20b64ece627d113b4e481f420925f9cd5a15bb28c7ce6b8a7f6fb6dfef2619b3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "20b64ece627d113b4e481f420925f9cd5a15bb28c7ce6b8a7f6fb6dfef2619b3", kill_on_drop: false }`
[INFO] [stdout] 20b64ece627d113b4e481f420925f9cd5a15bb28c7ce6b8a7f6fb6dfef2619b3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/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=forbid" "-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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2a49430bfd06865889597edeaa9628a3f76d6b12045915f3c50b9ac86d1a21ac
[INFO] running `Command { std: "docker" "start" "-a" "2a49430bfd06865889597edeaa9628a3f76d6b12045915f3c50b9ac86d1a21ac", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling lecture7 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `username`
[INFO] [stdout]    --> src/iterators.rs:247:5
[INFO] [stdout]     |
[INFO] [stdout] 247 |     username: String,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `disliked_songs`
[INFO] [stdout]    --> src/iterators.rs:249:5
[INFO] [stdout]     |
[INFO] [stdout] 249 |     disliked_songs: Vec<SongName>,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `listens`
[INFO] [stdout]    --> src/iterators.rs:250:5
[INFO] [stdout]     |
[INFO] [stdout] 250 |     listens: usize,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `days_active`
[INFO] [stdout]    --> src/iterators.rs:251:5
[INFO] [stdout]     |
[INFO] [stdout] 251 |     days_active: usize,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.44s
[INFO] running `Command { std: "docker" "inspect" "2a49430bfd06865889597edeaa9628a3f76d6b12045915f3c50b9ac86d1a21ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2a49430bfd06865889597edeaa9628a3f76d6b12045915f3c50b9ac86d1a21ac", kill_on_drop: false }`
[INFO] [stdout] 2a49430bfd06865889597edeaa9628a3f76d6b12045915f3c50b9ac86d1a21ac
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/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=forbid" "-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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 448cafae142c7541fbcf4ed38cbe49587fb67f90820857d80ce1e24965cf585e
[INFO] running `Command { std: "docker" "start" "-a" "448cafae142c7541fbcf4ed38cbe49587fb67f90820857d80ce1e24965cf585e", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling lecture7 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `username`
[INFO] [stdout]    --> src/iterators.rs:247:5
[INFO] [stdout]     |
[INFO] [stdout] 247 |     username: String,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `disliked_songs`
[INFO] [stdout]    --> src/iterators.rs:249:5
[INFO] [stdout]     |
[INFO] [stdout] 249 |     disliked_songs: Vec<SongName>,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `listens`
[INFO] [stdout]    --> src/iterators.rs:250:5
[INFO] [stdout]     |
[INFO] [stdout] 250 |     listens: usize,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `days_active`
[INFO] [stdout]    --> src/iterators.rs:251:5
[INFO] [stdout]     |
[INFO] [stdout] 251 |     days_active: usize,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.49s
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "448cafae142c7541fbcf4ed38cbe49587fb67f90820857d80ce1e24965cf585e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "448cafae142c7541fbcf4ed38cbe49587fb67f90820857d80ce1e24965cf585e", kill_on_drop: false }`
[INFO] [stdout] 448cafae142c7541fbcf4ed38cbe49587fb67f90820857d80ce1e24965cf585e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/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=forbid" "-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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 52a449980346d900285db7eaeda4a90b852a6f3ba806da38e2bdb198b0f9bdb6
[INFO] running `Command { std: "docker" "start" "-a" "52a449980346d900285db7eaeda4a90b852a6f3ba806da38e2bdb198b0f9bdb6", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: field is never read: `username`
[INFO] [stderr]    --> src/iterators.rs:247:5
[INFO] [stderr]     |
[INFO] [stderr] 247 |     username: String,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `disliked_songs`
[INFO] [stderr]    --> src/iterators.rs:249:5
[INFO] [stderr]     |
[INFO] [stderr] 249 |     disliked_songs: Vec<SongName>,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `listens`
[INFO] [stderr]    --> src/iterators.rs:250:5
[INFO] [stderr]     |
[INFO] [stderr] 250 |     listens: usize,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `days_active`
[INFO] [stderr]    --> src/iterators.rs:251:5
[INFO] [stderr]     |
[INFO] [stderr] 251 |     days_active: usize,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `lecture7` (bin "lecture7" test) generated 4 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.07s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/lecture7-629cbb50a08f9153)
[INFO] [stdout] 
[INFO] [stdout] running 6 tests
[INFO] [stdout] test closures::test_example_do_all_fixed ... ok
[INFO] [stdout] test closures::test_use_fn ... ok
[INFO] [stdout] test iterators::example_iter_explicit2 ... ok
[INFO] [stdout] test iterators::example_iter_mut ... ok
[INFO] [stdout] test iterators::test_all_below ... ok
[INFO] [stdout] test iterators::test_sum_squares_lt ... 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] running `Command { std: "docker" "inspect" "52a449980346d900285db7eaeda4a90b852a6f3ba806da38e2bdb198b0f9bdb6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "52a449980346d900285db7eaeda4a90b852a6f3ba806da38e2bdb198b0f9bdb6", kill_on_drop: false }`
[INFO] [stdout] 52a449980346d900285db7eaeda4a90b852a6f3ba806da38e2bdb198b0f9bdb6